I'm currently running on my second set of Bridgestone Potenza RE050A Pole Positions. No complaints, I got 30,000 miles or thereabouts on the first set. I don't track or auto-X the car. They do fine in the rain and provide sufficient grip for the level of hard diving that I do. In the 14 years that I have owned the car, I've run Michelin Pilots, Brdgestone SO-2, SO-3, and the RE050A. I don't know that I could tell you that there was that much difference.
In all this time, I've never had the car get away from me due to a loss of grip. I've had it hydroplane in the rain more than once. I have noticed with the RE050As that I can break traction if I apply too much power on a surface that is marginly slicker than pavement, say like the street paint on a cross walk or railroad rails placed in the street.