I bought these last year as the winter snow was setting in and apparently Aberdeen no longer gets gritted. I decided to go for the Quatrac as although it's an all season tire, 3 out of 4 of Scotland's seasons are normally winter!
Throughout the months of snow my old Audi never once got stuck and as the summer rain has come, the tires have performed just as well as they did in January.

Plus points:
- Very good snowy, wet and dry grip
- Progessive. You know exactly where you are with these and how close they are to letting go.
- Little road noise, but I do have a high profile size.

Negatives -
- Quite pricey, which is probably the only reason I'd investigate other tire brands/models
- My car has started to torque steer since fitting, but I have went from a 205 to a 195 size due to lack of availability when I was buying.
- As expected with an all season tire, these are quite a soft compound, so I'd expect I'll see 10k out of them before I couldn't use them in the snow (have done 5k now). I'd say they'd be good for 15k before down to 2-2.5mm.

Overall they're probably the best money I've ever spent on a car, and sadly, I've spent a lot.

Bought these tires 1 week before the snow hit my area and I cannot praise them enough! While everyone else is slipping around, I was able to pull away, stop and go round corners with ease. They are invaluable in the snow.
Dry grip is good, tires are a very little on the noisy side byt are comfortable. I only wish I had 4 of them on the car as opposed to just 2 n the front!

Cannot comment on their longevity or prowess in warmer, dry temps - will post in due course