I bought a Vectra B GSi 2.5 V6 (Facelift) with these already fitted in about 2005, I had not previously heard of them but now I won't fit any other tire brand to my cars. I have recommended them to anyone I know that asks me (I'm a mechanic) and as I look after all the vehicles in my family, I obviously only fit these as they are ready for changing.
The handling at the limit score I gave is at MY limit, I always remove my tires at 3mm in winter (all 4) and 2.5mm in summer, I never run tires to the markers as this is the MINIMUM for safety and I my own vehicles are always high powered.
I have never once felt like I was in trouble with these tires fitted and as for handling, my own opinion is why risk a change when these have performed at an outstanding level. This may just be how I am personally, but I check my tire pressures sometimes 4 times in a week depending on how many miles I have been doing, I check them after EVERY long motorway journey (say over 100 miles or more) and keep them supple with conditioners after washing (the outlay is a no brainer to keep the outer walls from drying out in direct sun if nothing else)
I have had a Vectra VXR now for over 10 years, I changed the Conti's to 'VRed's' as soon as they were ready and apart from a friend offering me a set of two Conti Sport Contacts for a price I wasn't able to refuse, I have only had Vred's on. I do all kinds of mileage, motorway as well as city and just occasionally when there is no risk to any other road user I have a little 'play' and put her through her paces ... these tires IMO are as crucial to the vehicle (and my peace of mind) as the suspension and steering ...
I get about a bit with mixed mileage, the last set changed - rear are still on at 4.5mm and 30,000 miles - front JUST changed, I removed the Reds after 23,500 miles at 3mm and put aforementioned Conti's on, I removed those at 15,500 miles with 3mm left ...
Overall opinion ... The most UNDERRATED tire on the market ... These are Very High Performance tires masquerading as a better than mid range tire ... but Shhh .. or the price will go up !!