xfx power supplies reliable?

[ValiantUK91]

So im building my brother in law a pc for a late xmas present i dont see him or my sister until next friday to exchange presents and a friend of mine is offering me a 750w xfx psu for no charge only thing is i dont know much about them

 

[ValiantUK91]

Couple of months old he upgraded to a xfire/watercooled rig so needed a lot more grunt