Looks like an alright deal. I'm a little sketchy about RoseWill PSU's as well, but they seem to have good reviews. Like every company, you can't write them off completely because you get a lemon. I'd take a chance, I did with mine. "PowerUP" didn't seem like a good decision, but 800w for 100 dollars was a hell of a deal. And I've loved it ever since I bought it.
Good luck with your purchase. Pics/benches if you buy, please.
If you are thinking you are taking a chance on a PSU, you take a chance on ANY. I've been dealing with NewEgg for 3 weeks returning and replacing my $165 Corsair PSU. Failure happens to the best of them.