Seemed to be quite a bit of discussion about this round here. We got one in and did some comparison testing vs 9mm and .45 ACP. It was anecdotal to a degree but:
The TCM rounds out penetrated 9mm and .45 ball in bulletproof glass. .45 had little penetration, 9mm went half way in and .22 TCM went 3/4 of the way through (enough to bubble the back of the glass). These were at short ranges (less than 10 feet). 9mm was out of a glock 19, .45 was out of an HK.
Vs smoked ham:
The 22 tcm hollow points were between a 9mm HP and a .45 HP. We should have some video sometime this week of the ham destruction. (The 12 gauge with tungsten 00 buck won btw
I'll link the video when we get them back from the guy who did the shooting.
Aside from ballistics the gun functioned flawlessly with both .22 tcm and 9mm ball. No failures what so ever. It was accurate enough to hit 6 inch plates at 50 feet. Felt recoil is very very light, it's not a 22lr but was noticeably lighter than 9mm from the same gun. It's very loud but didn't bother me with just plugs in. The sights suck for anything but target shooting, the safety was very stiff and the 22 tcm extractor is a pita to remove in order to switch to the 9mm. Those gripes aside, I ended up buying it before it went on the shelf at our shop, It will likely be my carry gun (with 9mm) for a bit and with some tweaks will be my pick for action pistol shoots.