Not customer service, but ordering parts from them has been an experience. Three times in the last 3 mos that I've actually caught, I've had temporary authorizations on my cc for parts ordered, then it vanishes, no charge, no parts. Friggin moon clips? 5-5 2014 was the order date, did get a backordered rear blade for a 625 rear sight.
30+ years ago I sent a Model 29 in for something, they were a dream to work with, as with most gun companies back then. Colt was a company you dreaded talking to back then.