My B17 was great right out of the box. I tried a Swallow or a Swift, can't remember which, and hated it. They're too rounded on the sit bits. Not nice! I'm now working up to deciding between the Selle Italia SLR Max Gel Flow and the Selle SMP Evolution. Both have cutouts but the Evolution has what seems to be better anatomical shape, what with the curve to it.
My B17 was great right out of the box. I tried a Swallow or a Swift, can't remember which, and hated it. They're too rounded on the sit bits. Not nice! I'm now working up to deciding between the Selle Italia SLR Max Gel Flow and the Selle SMP Evolution. Both have cutouts but the Evolution has what seems to be better anatomical shape, what with the curve to it.
http://www.ribblecycles.co.uk/default.asp?part=SELLSADD442
http://www.performancebike.com/images/performance/products/large/50-7380-YEL-ANGLE.jpg
However, the SMP is double the price of the SLR and I don't race so it may just come down to price.