The problem with the PSU is that it has rippling issues. One article found a 150mV ripple on a 12V rail at the 590W load mark. This is dangerous for parts in general, you risk damaging them over time. ATX standards allow a limit of 120mV ripple. That was on a GameXStream model, but it's a problem with the StealthXStream as well.
I mean, I doubt you'll even reach a 590W load, realistically speaking, but it just says something about the reliability of the PSU. Should be fine I guess. How much did you pay for it?