I have four. None for sale. I may be ignorant, but I can not duplicate any of the complaints I have read online on any of mine. Again, I may be the dumbest shooter on the hide, or perhaps the luckiest, but mine seem to work exactly as they are supposed to. Every time in every condition I've shot in, with no babying. (ok, no abuse either)
There are some members here who have a real problem with them. I don't have enough knowledge of those members to access the reliability of their complaints.
The only caution that I know of is that you want to be kinda easy installing the trigger pins. If you hammer them in like you are driving fence posts you can bend in the sides of the trigger and cause problems.