in 2005-2010 timeframe the 2nd tier and 3rd tier brands took giant leaps forward. prior to that, colt was in a totally different league, undisputed by anyone who knows what they're talking about. colt was "mil-spec" and everyone else was a lot worse.
over the past 10 years, colt has mostly stuck with "mil-spec", which is good. but the rest of the world realized mil-spec is just a baseline, and a fairly low bar at that, and have greatly exceeded mil-spec in many different ways. the downside to that is without a spec, things are unknown and a risk. mil-spec comes with a lot of testing and you know, specs. the various commercial offerings are probably a lot better, but buyer beware, as no one other than the seller is really testing them and they could change without warning. but a bazillion reviews on the major players seems to indicate quality is quite good. meanwhile, colt is dealing with bankruptcy and a sale to cz? so if it were me, i'd probably take a pass on them. but if you have a chance to pick up a 10 yo 6920 or so at a decent price...