All EXEDY clutch discs have spring center dampers to reduce the impact and shock loads put into the drive train. This protects the transmission and the rest of the drive line system. With any cerametallic clutch system, there will be some compromise of start up drivability as compared to a stock clutch (chatter on light throttle, low rpm start up). This characteristic is generally felt to be acceptable in modified performance cars.
The "thick" discs have better heat capacity and therefore better durability in demanding applications. Even with the "thick" disc, Exedy's three and four puck designs typically have less inertia than a stock disc and work well for street, rally and track use.