My C7 is prone to rust. Its currently in a zip-lock bag sprayed down with break-free until I can get it hard-chromed. I had two problems, it wouldnt slide-lock with the factory mag (replaced that day with a couple wilsons - seems to be standard practice for me) and the extractor started to lose tension after break-in (also replaced with wilson). Accurate little pistol to have a 3.5" bbl. Never failed to feed, even with a limp wrist. Personaly, I think they should have made a Companion with the CCW slide. The bobbed treatment didnt fit me very well, but I like the longer sight radius and it seems to balance better.
One thing that bothers me is that the mag catch isnt "standard," so without modifications, you cant swap in another one if the stocker breaks, which I have only seen happen once (not mine). Seems like the hole in the frame was too tight for an off the shelf replacement part.