My QHY22 has worked flawlessly for 2 years. Amazing camera.
The Orion Starshoot G3 was a funny story. First day I got it, I powered it up with my battery, and the supply was obviously a little 'variable', because within 5 seconds, to my horror, I saw a flash inside the unit, followed by the distinctive smell of ozone...
But it obviously had overcurrrent protection, because when I tried it again 30 min later with an AC power lead, it worked just fine, and the TEC has worked beautifully ever since. It's a low-cost camera, but well made! That was 3 years ago, and it is still giving great service.