Its not a great PSU, but its not total crap either. As long as he's not operating near its top-end limit of 600W, it shouldn't be a problem, and with that GPU, it won't be pushing it at all, and thus not really an issue. I know a few enthusiast guys who've gotten Rosewill PSU's with combos on Newegg (not expecting to actually use them) and have actually been impressed.
the terrible build quality of rosewill PSUs is in my knowledge, a massive issue. even when running well below the rated amperage.
as i understand, rosewill are close to bottom rung manufacturers. and really, paying alittel extra for a corsair PSU (a 520w would do) would be entirely worth it. it will last longer, be more efficient and MUCH less likely to die part way through its life.
im not trying to get the OP to spend more money, but a PSU is truly the one place where you should pay for a quality brand.