So tell me fellas - who's going to adopt to the snap on copper fittings

Is it reliable ? Dunno, but my Grohe faucet has a similar setup- ball ring, snap on - o ring connector setup and so far, Day 2, no leaks whatsover.

I wouldn't trust it inside walls just yet thought ;-)
Looks like alot of these guys are coming out with different variants of them - watts, brasscraft, etc.

snap ons

Small lines have been connected using them for years. The larger ones, although convenient, are too bulky for general use.