You'll know pretty early (and fairly often, with regular usage) if you have a bad one or not.
I purchased this one AFTER having purchased the next-tier-up-model, having had to return it for blue screens of death and a rattling fan.
This one, however, has seen usage >12hrs/day for weeks, including streaming, gaming, surfing, etc, with ZERO blue screens.
I think it's entirely possible you could get a fantastic one or a lemon. If you want this PC on sale, grab it on sale at $750, or grab two of them in case one is a lemon and return the second one.