I wouldn't say that it is more than enough but just right for your needs. Keep in mind now days there are a lot of so called quality and mid range units that are being made with cheap parts yet advertise even gold rating or higher that have a lot of issue so read up on complaints first before getting your hopes up. If you get any coil squeal from the psu complain and rma right away.
Have you seen the PSU brand he's chosen ? It's a CORSAIR Builder Series CX600 V2 600W.
In my opinion, Corsair is the best PSU maker out there.
So you really have nothing to worry about, the quality of your PSU is excellent.