I'm using two, I won't get rid of them, but I won't buy another one either.

I got a B17s for my mixte, and I LOVE it on that bike. I think that model saddle does really well on upright bikes. You're *** will be sore for a week at first, but it's worth it. The only problem I have is that it's got "sides" to it, it's not a thin seat and this creates rubbing when I wear shoter-style shorts. Not a problem if you don't mind longer style shorts. Brooks' thinner seats are a little out of my budget.

I got another B17s for my CX frame commuter, and I like a little less on that bike. It's just not as a good a fit on a bike that I want to go fast on, but it's isn't painful either (until mile 25, but I don't wear padded shorts). I'll switch it for a good quality thinner saddle if I find a good deal on Craigslist, which is what I did for my SS beater. I'm really happy with this saddle I picked up for $20, the guy wanted a gel seat for his bike : /