Saddles are such a personal thing. Some love Brooks others hate them. I had a B17 but on a non folder and hated it. Sold it after six months of daily use. It just didn't work for me.

On my Brompton I decided to try the B17 again, not because I think it will be comfortable but it because it looks good. It just suits the bike with copper rails and rivets. My feelings are it is just a saddle, I don't love and I don't hate it. Neutral is the best description.

On my Rivendell I have a B67. I love this saddle but as Joe Remi said above it is best for bikes with bars higher than the saddle. The only drawback to this is the weight. It weighs almost two pounds.

Even the B17 on the Brompton adds a lot of weight. I think 1nterceptor has the right idea with using the Brooks C17.

The saddle I love and had it on two of my bikes is the Specialized Avatar in 155mm width. This was my go to saddle for daily commuting.

In the end I think it is about trial and error when you get a saddle. You hope the best on the first one you choose. Good luck.