I’ve had a TH50C for about a year now with no issues, hope that doesn’t jinx me. In fact, yours is the first bad thing I’ve heard about them.
I have an AGM Rattler as a backup and I can’t get a set of batteries to last 1.5hrs in it. I use the external batteries in the iRay and get about 3hrs with each battery.
I’d buy another in a heartbeat at this point.
I’m not a “professional killer” but I do go out a few times a week. I’m a trapper first, and supplement kills with the thermal. Only get paid if things die so it’s been a GREAT scope for me.