The 625 PC/JM, 627 PC, 929, R8/TRR8, and Ruger Super GP100 are all really beautiful guns that have suitability for competition.Deerassassin22, just looked up that S&W 625! What a nice revolver!
Ultimately, though, revolvers in competition are pretty stagnant right now. Very few people shooting them and MDs don't want them (except in ICORE), so you wind up with very little desire to improve the ruleset - and what little there is gets shouted down by people who don't want to change their equipment to deal with the new rules (optics? NEIN!). No one shoots anything besides 625s (or maybe full power 357s through 627s) in IDPA seriously because they absolutely do not want to deal with speedloaders. Speedloaders are garbage on the clock compared to moonclips. Everyone knows it. And the hit you take from shooting major PF simply doesn't compare.
Similarly, if you're not running a 929 (or maybe a Super GP100 9mm) in USPSA, you're running at a real disadvantage. Those extra two rounds between reloads more than make up for the power factor difference.
I'm looking forward to shooting some revo this year, but I'm realistic about the state of these divisions... which is not great.