I've got it on my bike and stuck it on the trainer for a few minutes. It's not bad if I'm in just the right spot, but I don't know how that will translate to a longer ride. My seatbones are wide, but they're big, too, so they don't hang off the sides all the way, just a little over the edge. I really like the shape, but I'm concerned that I'll have too much soft tissue pressure.
I'm not getting my hopes up, but I'll keep you posted!