no you should be fine kato. I myself have been doing wheelie "nothings" or no footed manuals sitting on the seat, however you want to call it for a long time now. I've ridden everything from the primo padded seats to oddy 99'rs to plastic. it honestly doesn't make a difference on those. that little bit of padding in a bmx seat isn't noticable at all. I will say though if you get one of those ridiculously padded seats with like a 1/2" of foam in them. that you WILL notice. it's still not a lot and is compensatable but it is there. So as long as you stay with a fairly normal bmx seat you won't have a problem though. Everything on the flatlandfuel site right now would work just fine. you'll probly never know the difference. On another note though.. RAISING your seat will greatly improve the wear and tear on your butt bone. It will result in the bike being less straight up and down. and you will in turn, sit flatter on the seat and it helps me greatly. you won't be trying so hard to fight the feeling of sliding off the back, though it will change the balance point as well. other than that, you probably won't notice any difference as long as your seat isn't of the "pillowtop" variety.