I have a cheap Nashbar suspension post on my frankenbike and it seems to work, BUT in only a few months it has loosened where the seat mount attaches to the post allowing the seat to yaw a bit...not a showstopper, but occasionally disconcerting. I'm going to replace it with my old aluminum post. I've put 28mm Conti's on that bike, so do not think I'll miss it.
Update: the Nashbar post is back in service. There was a clamp that required tightening under my seat bag...duh! So, no more yaw. Nashbar post costs around $20.
Last edited by Stormsedge; 08-26-17 at 02:50 PM.