Well, you’re definitely correct about many PDs using revolvers before switching to Glocks. That goes back to the Miami shootout with the FBI; FBI agents were still using revolvers at the time, and they were significantly outgunned b/c one of the suspects was armed with a Ruger Mini-14 rifle. As a result, the FBI started looking for a better sidearm, and the initially settled on 10mm before adopting the .40S&W. Glock managed to bring a .40S&W pistol to market before Smith & Wesson did (!!!), and then charged below cost for PDs in order to convince them to adopt the then-new firearm.
And after finding an article about it, it looks like the NYPD did want to match the pull of their old double-action service revolvers. Which is nuts.
IIRC there’s one part on the Shadow II that’s known to fail at regular intervals, I think the extractor? It’s something that’s well known to competitive shooters, common enough that they keep spares on hand the same way that most competitors keep spare optics batteries on hand. I don’t know that I’d try running a Shadow or Shadow II for thousands of rounds without cleaning, just because it’s got closer tolerances than a CZ-75B. But that’s just me.
Oh, and if you like CZ, check out KMR Arms. KMR does some of CZ’s manufacturing, and also does their own line. Sadly, they aren’t yet generally available in the US due to the general difficulties in importing pistols, but I’ve heard they’re trying to work out distribution. These should be viewed solely as competition guns though rather than tactical or duty firearms; you should probably not be using any of them as a carry gun.
EDIT: A range can probably get away with a little less cleaning, because they limit the ammunition that people can use; they can only sell very clean burning ammunition that won’t leave a ton of powder and copper fouling. Most people that practice on their own use whatever is cheap, which may even be shitty Russian surplus Wolf ammo with lacquered steel cases, and corrosive Berdan primers.