If you aren't going long distances or long ride times, any saddle should work. On my commuter and road bikes I have B17s, but on my mountain bike I have a $14 Bell Wally world saddle. The Bell is too squishy for long rides for me, but it has the anatomical hole so its doesn't put the junk to sleep. Its been fine on my mountain bike I guess because I don't usually ride for hours without stopping, I come out of the saddle more often during rides, and I get off and push the bike up and down steep areas.