I have an ultra 1000 powering my system fine.
Its been reliable as heck, and im coming from a corsair AX1200, which gave me grief right before it died.
I honestly feel its as good as the AX1200 i had.
I just hope it doesn't give me the same grief the AX did before it dies.
But i have to note, i did push the AX hard while i had it with massive SLI and watercooling builds with 6 pumps and over 18 fans which 8 of them were high powered server fans.