This was all back b/f the power meter, but to this day I still say nothing was 'slipperier' than my Softride with a Zipp 1150/TriSpoke. Thing was a blast. Comfy too although that isn't why I'd get another one now, ultra distance holds zero attraction to me at this stage in my career. I ride alum now and I honestly cannot tell one iota of difference b/t this or my last carbon frames. 3 hours max is as long as I ride though.