I have the tall moose seat on my cr250, mine is very soft. I think i actually sit as low or lower than the stock seat due to the softness of the moose.
I put the standard SDG YZ seat on, and it was a brick. Stock is better. Now I have the stock 2004 YZ seat, great cover. Top allows some scooting, sides are very agressive non-slip. Works great. No moto, techincal trails and climbs.