I bought the TM22-LITE-18 last week (the polymer version) and so far I like it a lot. I've shot about 200 rounds of mixed cheap ammo, mostly Remington thunderbolt. Had a few FTEs but I think it was due to light loads in those rounds, I could tell when it went bang that they were weak so it didn't cycle the bolt. Otherwise no issues.
One thing I don't like is the lack of clarity when purchasing. I didn't know what the rifle was, just happened to see the sale advertisement for it and at $189.99 decided to go for it without researching it. Then when I got home, everything I saw online said it was all aluminum. Well mine isn't aluminum even though it's labeled on the receiver the same as the aluminum version and the paperwork says its aluminum. Long story short, I finally realized it's the polymer version which was just released a month or two ago. Once I figured out I didn't get scammed I was more at peace about.
Also the disassembly instructions in the box are for the aluminum version which is slightly different than the polymer version. Minor annoyance but would like more accurate information about the model.
overall I'm pleased. So pleased in fact, i bought 2 of them. I would like to get one of the aluminum variants but they're out of stock everywhere I look. Gonna have to wait I guess.