Every other model of strike-x has poor reviews, like this one:
http://www.kitguru.net/components/power-supplies/zardon/aerocool-strike-x-800w-psu-review/7/
And I don't much trust xbit labs anyhow, as I've seen them give good reviews to some terrible units in the past, plus I was given a heads up by another PSU insider of trustworthy credentials to take anything printed by them with a grain of salt. (To put it in a nice way without being directly insulting.) So in my opinion, and that's all it is, I wouldn't personally trust my high end hardware with that unit.
It only takes five seconds, or less, for an inferior unit to toast your rig.