I had one for a few years that I got as part of a trade. It left my life as part of a later trade.
It was absolutely reliable, and would even feed empty cases from the magazine. The mags are the same as the Swedish K and used to be cheap and plentiful, but not sure if that is still the case.
It was as accurate as any other handgun I've ever owned, just awkward to hold on target and had a nasty trigger. Big and heavy compared to a "normal" handgun; I never really figured out how I was supposed to hold it, or what I was supposed to do with it.
Biggest problem was the rear plastic receiver cover disc thingy. They liked to crack and break; I always wanted to make a replacement from aluminum but this was years before I had my own lathe.
With Glock 33 round magazines available, the Tec 9 kinda became even less relevant to real life and more obsolete.
As far as betting my life on one, I apparently don't go into harms way as often as the typical internet user. You did not mention any imminent or voluntary tactical/apocalyptic situation in your post so you might be OK buying a gun just to scratch your "itch".