I've had Vredestein Quatrac 5's on my Ion since last October and I'm very happy with them as an All Season tyre in the UK.
I used them through the freak ice and snow this winter and they handled it admirably, I didn't actually get stuck once, while a lot of other cars around me did! I'm certain I would have been stuck in the same conditions with the Hankook Kinergy Eco summer tyres that were on it before.
They have very deep tread blocks and loads of tiny sipes so also perform excellently on roads with standing water. The difference in grip between dry and wet roads is fairly minimal, even with running water on the surface.
They are a little bit of a compromise above 20C on dry summer roads though - they start to get slightly "squidgy" with too much power around tight corners, presumably due to the softer winter rubber, so they don't quite have the same outright grip or handling as dedicated summer tyres, but with the pressure bumped up to 40psi a lot of that disadvantage is negated, and they definitely feel a lot better at 40 than 36psi.
I've found about 40psi is optimal in summer and 38psi in winter on these tyres.
As I can't be arsed with changing tyres every six months or trying to find a second set of rims, and the car is used mainly for a daily work commute and shopping runs, the small sacrifice of summer performance being not quite as good as a dedicated summer tyre is a worthwhile compromise for me, and probably makes me drive a bit more economically as well...
Their rolling resistance rating is actually better than the Hankook Kinergy "Eco" tyres that were on the car before that claim to be low rolling resistance!
I've only done 6000 miles on them so far but there is no real sign of wear yet, apart from the slight normal feathering of the surface of the tread.