I used one of those saddles for a year on my hybrid, which was my only bike until last October. Mine is a SpongyWonder. I found it a little weird at first, felt a little tipped forward, but then liked it quite a bit. I rode with it all last year, and occasionally this year. It's perfect for the more upright position on a hybrid. I never tried it on my road bike. The funny thing, though, is that about three weeks ago I rode that bike for the first time in a month, and the seat bothered my sit bones. Maybe I'm just so used to my road bike that it felt weird. Anyway, I put the original saddle back on, a selle royal big jel thing, and it felt fine.
I'm still not thrilled with my road saddle (terry butterfly), and am just about ready to try S-dog's suggestion of a Koobi.