Guys, the thing to do once the money has been spent is to go to the range.
I would discourage anyone from buying one based on their record vs. the record of the milspec, but once it's yours, the issue is finding out whether or not the one you have is reliable. If it is, I would say that the record of the rest of the micros in the world doesn't matter. I just think the odds are against the one you have being truly reliable.
None of the micros, ultras, compacts or defenders I've been around ever went more than 100 rounds at once with no malfunctions.
I've run 300 rounds in one sitting through my milspec with no malfunctions, took it home, put it away, took it back out and ran 300 more. After that, I cleaned it.
If your micro can do that, then I probably wouldn't worry. I've just never seen one that could, and I've seen several that couldn't. For that reason, I would test a micro a lot harder, and demand a lot more from it than I would a milspec. The milspec is proven, the micro is new. I would demand that it go more like 1,000 rounds of FMJ without a hitch, and I would demand that it go 500 rounds of the ammo I planned to carry without a malfunction. If it failed to return to battery on the carry ammo, (most likely) if it started slamming shut when you slam a reload into it, if it failed to eject, or if it destroyed it's recoil mechanism, I would start negotiations with Lisa at Springfield about what they were going to replace it with.
I've run 600 rounds of FMJ through my milspec without cleaning, and I've run 500 rounds of carry ammo through it without cleaning, all with no malfunctions. I have confidence in it.
50, 100 or 200 rounds doesn't really impress me, and when I hear someone say that they've put 100 rounds through their new weapon and it's dead reliable, I just roll my eyes.
My milspec goes thousands between malfunctions, and then it's usually either my fault or because the springs are getting weak. My loaded has yet to do that, but that's because it's new, it has less than 500 rounds through it. Once all the garbage is replaced, I have high hopes for it.
I wouldn't carry a weapon that malfunctions every couple hundred rounds, and I don't understand why someone would.