I fitted the Primacy 4 after using the Bridgestone ER300. It lasted for around 3 years before I replaced the primacy 4 with the Kumho HS52.
The reason I chose this Michelin is because of all the good reviews online.
The Primacy 4 from the moment I drove from the tire shop, they felt slippery and floaty which is not really what you want from a new tire. These tires always slipped under hard acceleration and they never stopped slipping. My car is only a 1.4 TSI with 122BHP so nothing really powerful, yet the primacy 4 is just that bad in dry grip.
On the highway, It was comfortable and quiet (quieter than the ER300 I had before) but on worn highways where there are some dips in the surface, the car would just feel floaty and does not make me feel confident.
In the wet they were good, However, I live in a hot and dry climate and I rarely care about wet performance for a tire.
If you notice, all online reviews focus on wet performance and very little on dry performance. This turns out to be the reason why the primacy 4 are well regarded online.
For comfort however, these are quite comfortable and make speed humps seem smoother than other tires. But at what cost? I would choose dry grip over comfort any day.
For braking, dry braking was about average, not impressive for a new over priced Michelin. Wet braking was good.
For Wear, the tires lasted for just over 3 years and have done about 33,000 km, The thing is, I have never replaced tires because they are worn to the limit. Where I live, all tires dry rot way before ever wearing down. So all the good wear performance mean nothing for me when choosing a new tire, unless they start testing new tires for dry rot maybe!

So in conclusion, for my use and the climate here, Wear performance mean nothing, wet performance mean very little (If it is pouring down, I would just choose not to drive anyway). Comfort was good. Road feedback was average but the Passat B7 does not provide that much feedback either. Dry grip was just not good at all, always slipping under high acceleration and dry braking was above average.

I have replaced the primacy 4 with the Kumho HS52. In comparison, the HS52 has much better dry grip, they actually feel like new tires, they are less comfortable that the primacy 4 but I would choose dry grip over comfort. For wet grip, I haven't tested it but I live in hot dry weather anyway, so rarely do we have rain so don't care that much.

To describe the primacy 4 in short sentences:
Does not grip well in the dry at all. feels slippery
Feels floaty and does not induce confidence.
Very good in the wet.
Comfortable and quiet.

Would not buy again, even if they were cheap.

Like in all subjective scores, these are relative to the other tires I used on the same car. These were cheap Winter tires (for one Winter) and UHC All-Season Hankook Kinergy 4S. Please also note that my Michelin Primergy 4 are OEM tires for an EV, so they might be different from the retail version of the same model.
Michelin Primergy 4 loses in every category to Hankook Kinergy 4S:

Wet roads: Michelin start to skid unpredictably with quite sudden and nasty understeer and the tire doesn't react to weight transfer when you slow down a bit to load front tires for more grip - the car just keeps sliding until the speed reduces enough. Hankooks feel way more safe in same situations and way more manageable and react to corrections just nicely.

Dry roads: Michelins start to slide quite early (earlier than Hankooks) on a heavy Hyundai IONIQ 5, but are very predictable and forgiving and once they start squealing they are still driveable and react to the steering.

Hot dry roads: I'd expect a Summer tire not to overheat on a hot sunny day, but hey... It is normal when all-season Hankooks start sliding more and become mushy at temperatures around 25-27 C and by 30 C they drop quite noticeably. But Michelins start to slide more at above 30 C, which is surprising. I'd expect a Summer tire to hold to at least 35 C. Of course, the road is way hotter under the Summer Sun. however my next Summer tire will definitely be something that can stand the heat better.

The vehicle skids very badly.

At 16 inch, difference between budget and premium is around 20 Euro. Why risk your safety and comfort and not buy Michelin or Conti? For me Primacy 4 was a reliable, silent partner that I would for sure buy again.
I am now going for a 19 Inch and feel like the 100 eur difference between medium and premium or 200 eur between budget and premium manufacturer makes the choice a lot harder.
Oh and I couldn't select Skoda Superb 2012 and I chose equivalent.

Complete set installed in April 2024. For now, they feel much quieter and more comfortable than the dunlop sp050. We see how it behaves over time.

Have tried other makes but have not found anything to match Michelin for reliability, performance, safety and longevity.
Best and only tires on the market for me personally.

No problems at all. Excellent.

Always used Pilot Sport 4 tires front and rear for summer and CrossClimate for winter.
Tested the Primacy 4 AO 93Y dot2019 that summer for a week on the road and a track day, but did not like the lack of grip when the tires heated up.
Now I'm using them as the rear tires on my rear driven car and together with the PS4 at the front they give fun (predictable drifts) on twisty roads, a secure feeling in the rain and the are so much more quiet and comfortable.
Maybe I'm just getting old (and sensible) ....

Primacy 4 2S came with the new car. Useless on water, noisy as heck. Will not buy again.

Terribly disappointed by these Michelins. A-class rolling resistance tires demonstrating fully the challenge of low rolling resistance designs. Rut sensitivity so bad it’s basically dangerous. Very poor comfort as well due to excessive shake. Steering is delayed and non-linear. Plan to replace next summer after only one season.

This is a review comparing it to the summer tire Michelin Energy Saver that I used last time.
The vehicle installed is a late 2011 Toyota Wish 1.8S with a current mileage of approximately 270,000 km. The average annual mileage is approximately 22,000km, including 14,000km on summer tires.
Due to the snowy terrain, we used three types of tires: summer, all-weather, and studless. After use, they are cleaned, maintained, covered, and stored in a tire stocker in the garage.
In the summer (no snow season), it's summer tires ➔ In early winter (snowfall season - before the snow compaction road), it's all weather ➔ In the middle of winter (snow compaction road - icy road), it's studless ➔ In early spring (ice melting road - before the end of snowfall), it's open Ruler Weather➔In the summer Samataiya

Dry and wet grip: I felt that the grip of the Energy Saver had decreased after 40,000 km, but I felt that the grip of Primacy 4 was almost the same after 40,000 km as when I first started using it.
Tire wear rate: The mileage at which the slip sign appeared was 50,000 km for the Energy Saver and 55,000 km for the Primacy 4, which is 10% better.
Comfort: I felt that the Primacy 4 was superior in terms of comfort at the time of purchase, but after driving 50,000 km, I felt that both cars were noisy. Comfort seems to decrease in proportion to driving distance.
Repurchase: Currently, the plan is to repurchase Premacy 4 again. The reason is that the initial grip performance does not change for a long time, and it has high wear resistance and long life.

In the dry the Primacy 4's been excellent. Grip feels almost infinite, to the point where I find it hard to use all of it on public roads. In terms of comfort, it's a quiet, pleasant tire to cruise with. At highway speeds up to 180 km/h I can't really find any fault with the tire. It's relatively quiet and absorbs enough of the road to almost feel like driving on a cloud.
In the wet the grip is still above average, much better than my current winter tire (Vredestein Wintrac Pro in the same tire size). Comfort and noise levels are in check, although it's harder to judge noise with all the extra noises introduced by the water on the road.
One thing I sometimes miss is communication during turn in and feedback from the road. I guess this could be party because of the relatively meaty sidewall but to me it was noticeable enough to point it out.
Regardless of that downside, overall a great tire that suits the characteristics of a 5 series well.