I have a Sound Percussion motorcycle style throne. Had it for like 15 years maybe 20. No problems with it. Just wanted to let you all know - that they are out there. Not sure how they compare to Roc-N-Soc in terms of softness or durability, but I doubt there is any significant difference. My SP is as good as new after a couple decades and I have never gotten sore or felt that it was too hard, etc.