I have been running SR11 since early last year in one bike and Record 10Sp in another. I do use the record chain and the Chorus cassette in the SR set. I cannot compare it to Shimano either as I have been using Campy since the late 80's. Well, with the exception of 2 one year periods. In one, I ran Shimano 105, which was great and reliable back then for what it was and the second period was Ultegra. I hated the living crap out of the fit of my hands on both briefters. I just never seemed to find a comfortable position for even a second. Campy has always fitted my hands like a glove, so it has been a no brainer proposition to use it.

Personally, If I had to choose between ****mano and Campagnolo today, it would be hands down Campagnolo. Yes, it can cost a bit more, but the option of not being disposable and the fact that these things are just made to last forever are a huge plus. The ceramic BB bearing in SR11 is simply amazing. I mean, I don't feel I go faster or use less watts, but it just seems to spin like butter. It is hard to describe, but compared to my compact Chorus 11Sp crank it is a noticeable difference.

If I had to guess as to why pro's don't use SR11, I would have to say weight. Between parts, frames, and wheels being so light anymore, a lot of the high end pro's actually have to add weight/heavy parts to the bikes to achieve the UCI legal weight. Performance wise, outside of the ceramic BB bearing described above, I can't hardly think of anything that SR11 does better than Record or even Chorus for that matter. As DaveS pointed out, it is weight that makes the difference.