I had a distributor send two G2C's in 9mm to me by mistake 5 years ago. Customer picked his up and I was going to send the other one back. Then I started to look the gun over. Was impressed by the great trigger, loaded chamber indicator, re-strike capability, great ergos for my hands. Was even more impressed with how well the gun shot, and its reliability. It has only choked on on one kind of ammo, Rem jacketed flat nose exposed lead stuff. Everything else has run perfectly in the gun. Only real downside was the cheap plastic sights. Perfectly usable, just cheap. Fortunately solutions abound.
A quick trip to LakeLineLLC got me the following: Stainless recoil assembly (preemptive install) stainless striker sleeve for the same reason, set of steel fiber optic sights (old eyes), and a new trigger (just the lever itself, guts were fine) as I don't like trigger safeties. Trigger came from KeepTinkering.com.
What did I end up with? A $310 carry pistol that has been utterly reliable for over 4k rounds, as accurate as I can shoot a pistol, that just simply does its job.
See no reason the same gun in 40 S&W would be any different. And there are several reviews out there that echo my sentiment. Go for it OP.