Wow. That holstering with the "click" is

I've shot guns with a ZEV trigger (whole gun was a ZEV custom deal). I don't recall anything that made me want to get one. I've tried my 34 with ZEV and Ghost disconnectors. Didn't care for the Ghost. The ZEV is ok, but I wish it had a more solid wall. The 34 is pretty much exclusively for USPSA though, so I was more willing to test out stuff.
A lot of the custom triggers on the market are polishing, filing, etc of stock Glock parts. I haven't tried monkeying with my triggers much. I will say that the Salient guns that I've shot have really nice triggers, but those are $3000+ guns!
I mean I appreciate what can be done with custom triggers. The trigger on my CZ SP-01 Shadow is significantly nicer than the stock SP-01, but that's also because of things like no firing block safety. I've shot some really nice 1911s with awesome triggers. Those would be more for competition or just range fun, at least for me.