I had a Power Expert 143 and could never get on with it. The cutout worked well in terms of stopping numbness but I've got very narrow sit bones and it was still a little too wide - the angular flair-out would give me saddle sores if I rode too long. I got a Selle Italia SLR Boost Superflow S3 and initially it was perfect in terms of the sores but there is less padding than the Expert and it's very stiff - so it started feeling uncomfortable after an hour or so. However, a few rides to toughen up the rear (and a bit of adjustment), and it's just about perfect. In an ideal world, I'd have a bit more padding, but I'm happy as it is.
Discuss light weight issues concerning road bikes & parts.