I've tried it on my GS4 to connect to an HTC One, and once you figure out the enabling sequence on both devices, it works fine for small file transfers. Beyond that, the immediate uses are limited unless you want to tinker with NFC tags.
If a viable retail commerce platform finally takes off for NFC, it could be really useful, but industry news for the past couple years doesn't look too good. Google Wallet foundered, and Square (which is popping up in small businesses all over the place) seems to think the app-based payment approach is more viable.
He who laughs last, laughs first next time.