Ive never had any slippage problems in the Tm.I think sometimes people just look for a reason to complain when they spend alot on something = expectations not met because the price set em to high.-or maybe they should wear briefs.Honestly Ive wore The Tree Flex,the Sequia,master 2,versatle,Butterfly 2 and there is no comparison to the Tree Motion.I think maybe you guys need to adjust something or maybe I have problems but just dont really notice it.Honestly in all saddles isnt there problems of the creepage,you get used to it and move em down a notch.