I was running Vreds when I picked up the Ed30 and I have to say on a stage 2+ car, the dry performance was ok, but still could spin easily. In the wet, they were quite a lively tyre, but again calmed down after a spirited drive and a bit of heat was put into them.
I am now running PS3's and can say there is a definate difference, the car feels a more planted on these with more confident grip both wet and dry, It seems to grip better on turn in and holds on more before hints of understeer appear.
I also have a set of R888's on my summer/track wheels. I ran these for a large part of last summer. Brilliant tyres in the dry, stick like s**t to a shoe. The car feels incredibly planted on them, but what you gain in grip, you lose in longevity and also there is an increased road noise!
Its worth shopping around. I got my PS3's fitted and balanced at a local tyre shop for £12 a corner more than I was able to get the Vreds for online.