Rumor has it that the plain ol' Lady Gelflow is just a Terry Butterfly in nicer clothes. My first impression of the Lady SLR is that the cutout isn't quite as awesome as it looks in photos- it is large at the back, but it gets somewhat narrow in the front. It still does its job, though, and my 70 mile ride on Sunday will be the real test. It's pretty long, which I find to be a little annoying because the way my legs are built makes me have to scoot the saddle very far forward, which puts the long nose up where it can poke me in the butt or back when I'm starting/stopping.