I actually have a B17 Narrow. It's not wide enough in the back, and it also feels like it's much stiffer than the standard B17. Given a choice, I'd rather go with a standard B17 and try to fuss with the setup.

I might add, I find this somewhat amusing as I'm actually on the thin side. I guess I just have a fat ass.

However, as long as I have to pick up a saddle anyway, I'm not averse to trying a different saddle that may be more appropriate for the more aggressive position.