I have not test ridden the X300, but i looked at one at the local dealership. Standing beside the bike and pressing down on the seat with both hands,and all my weight, the seat squished very little. Sitting on the bike the seat felt as you said, like a brick. You stated that the seat seemed to get softer as you rode it. Maybe it will be softer and more comfortable once it gets broken in. I've noticed that corbin seats as well as mustang (my favorite seat on my harleys) are alot more comfortable once they are broken in. Can someone that owns the X300 give us some feed back on this?