Sits too far forward on standard seatpost
First B17 front rivet popped out (before any adjustment to tension). Got new rivet sent to me under warrantee, but could never get it back to 'like new'
Different fit when bone dry vs. humid vs. wet. Saddle would sag in middle and get more uncomfortable.
Replaced B17 with Team Pro. A better fit, but still same sagging issues. Even just my sweat would change fit.
Rail broke on Team Pro after 10k miles or so. Replaced under warranty.

Now using a Fizik Aliante and it is more comfortable and consistently so with never a concern for the weather.