B17N for me. I had some numbness, chafing, and general discomfort issues that I tried to resolve with all of the fancy gel RX saddles. Then I found BF, measured my sitzbones, and tried the B17N. Break-in was no big deal--problems solved. Actually, the final solution for chafing was some Burts Bees Salve for the nether-regions, but that's another thread entirely...
Cheers!
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2008 Red Co-Motion Speedster Co-pilot (Redster)
2009 Surly LHT (captain's commuter)
2009 Surly Crosscheck (stoker's road bike)
2007 Giant FCR2W (stoker's commuter)
1980's NOS Legnano (stoker's toy)
1970's Stella rebuilt as fixed-gear (captain's toy)