I rode a brooks b17 for quite a while hoping I would eventually break it in properly and it would become comfortable. Unfortunately, it was pretty uncomfortable out of the box, and it never really got better even after thousands of miles. This was on a surly LHT with the bars just a *tiny bit below saddle -- a seemingly ideal set up for a b17.
I began to suspect that my sit bones are just too wide for a b17, so I bought a b67 and tried it out.
Best saddle I've ever ridden on! The difference in comfort is night and day. I'll never want to ride anything other than the b67 now.
There's no real point to this thread, other than a shout out to people who may have never got used to a b17 and were maybe thinking about getting a wider model. It certainly worked for me.