Did considerable research about replacements for the OEM Bridgestone RE050 runflats which had poor treadlife, hard ride quality and concern with four season performance. Considered runflat and nonrunflat. Read very good reviews from TireRack testing and other owners and chose the RE960A/S RFT. Ride quality was a huge improvement. They don't tramline like the RE050's, and like the safety of having RFT. I'm not tracking the car but enjoy sporty driving and the handling has been great.