I've had a set of V12's on the Legnum for the last 14 months, and have done 20,000 miles on them, and they're just starting to come towards the point where I'm needing to replace them.
The Legnum is a heavy car (1680kg), and full-time 4WD, and they have also done a track day at Castle Combe, as well as a couple of days at Santa Pod and some hooning around an old airfield.
In other words - they've lasted well, and they have been good in all weather conditions, and the car didn't put a foot wrong through any snow I've driven in.
Obviously - your Passat will be different, the tyres may be awful for your car - but I'm going to be buying myself another set of them for my Legnum. I've also put a pair onto the back of my mum's MX-5, and they work well on that as well.