I have a Serfa that I love. No break-in period at all. I originally had it on my mtn bike, now on my road bike. I'm not sure of the model, though it's a woman's, and has an RX "button" towards the front of the saddle. The thing I like about this particular model is that the hole in the middle is larger than others I've seen so I'm able to "nestle in" if you get my drift. I do about 18-26 miles commuting/day. Haven't done more than about 40 miles in a stint, but this one is great. Good luck finding one....R