I have a Edge that I bought used, that the previous owner knew nothing about. it is a tack driver and an excellent trigger and for the last ~3 years has been perfect. Until this weekend when the left side safety broke at a sectional (of course I did not have a fitted spare, but I do now). My experience with this gun has been out standing.
My son has a DVC .40 Limited. and it took a lot to get it running right. ended up sending it to atlas to get worked over. They for it running but it was another $400 on top of what the gun cost. then there were the other user fixable things
1. Front sight fell out at a sectional
2. rear sight screw broke in a class
3. extractor was worn to a nub after about 1k rounds
4. Barrel link broke at an area match after about 3k rounds (STI tech said that was a common problem. He said the TiN process made them brittle.
Based on my experience I am not sure if I will ever buy another STI gun