Oh, definitely wouldn't spend the extra money for chorus, and they're generally unavailable anyway. It's just that Ultegra is so much less (or was the last time I looked) and I like the way they shift better. I'm pretty sure I have a Centaur on my bike now. I think I'll stick with Centaur 13-26, although I might consider 12-25 instead, not that it'll make that much difference. I think this time I'll have a pro do the adjustment, I never seem to get it perfect. The bike is due for a full tune up and my usual mechanic doesn't do a great job (that would be me). The bike is a 2006 Kuota Kredo, with Chorus 10 speed, Easton Ascent/Orion F/R wheels, FSA SLK crank, and assorted other bits of the same caliber and vintage.