I don't have any trouble with the yellow strap. After trying a few differnt ways to clip into it, I settled on Kong HMS' Biners. The large uniform shape seems to work/wear well. I had a little trouble with the leg straps loosening, but once I had it set the way I like it, a little electrical tape behind the buckles help stop the creeping, and I don't have the extra strap length snaking out (I can't bring myself to cut into something I paid that much for, even if it's just to shorten up a too long strap. Maybe part of why I haven't modified mine).
The extra mobility of the sliding d hasn't made a noticible difference in my climbing, but my back sure is pleased. Not near as much twist and strain put into it.
If I had to pick something to complain about with the Butterfly, it would be that the two side d's fold in and lay flat against the strap. Because of their design, they don't swing free like the ones I was used to.
I should also say that I don't climb but a fraction as much as a lot of you guys so things like equipment wear and productivity will differ from what you would expect to see.
If I had to buy a saddle today, I'd make the same choice. Komet Butterfly.
Louie Hampton