Is this PSU any good?

Thats not a bad PSU you shouldn't have any problems running to 5870's with that its got 4 rails with 20 amps on each so it should do just fine but if you wanted to get maybe a little better you could buy the thermatek.
 
I would look for a psu that has a few more amps on the 12v rails that might be ok for a single 5850 but in crossfire I would worry about it.
 
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