i have the SP5000s and have been very happy with them. dry traction is great for an all season. IMO its not too far off the 712, though its hard to be sure since the suspensions of the two cars being compared are quite different. anyway, for not much more than the 712s, you can have a tire that stays on all year (if you live in a cold environment
). its also my understanding that the P7000 SS aren't that great. they were good when they first came out but now other tires (such as the dunlops) have eclipsed them. i've heard they are quite noisy, don't have a lot of grip, and are worthless in the snow. i still don't know how the SP5000s do in the snow due to mother nature being stingy with the white stuff. also, i did auto-x on the dunlops once, just for kicks. keep in mind i just guessed at the pressures. basically, what i found is that they were fun. i ended up fastest G-Stocker on street tires that day (although there was another GS RS that was running RE730s in STS that day and was quicker, but he's always quicker. he took 2nd in STS that day, btw
). i found that if you came into a corner too hot, the tires plowed real bad (this is w/stock suspension mind you) but as long as you were smooth and gave some leway in the braking zones, you could get around quick. granted, i'll be glad to be back on R compounds next season, but just thought i'd share. it does ok, though against a dedicated summer tire, you're going to have a tough time in STS.