Although a lot of people seem to dislike it, I absolutely LOVE my Ultra 500w PSU.
Only quirk it has it a hot +5v, under multimeter (with loads) it reads 5.6v and when the PC is idle 5.8v. My other voltages are ROCK SOLID.
Under load, running the following:
15K hitachi SCSI + 10K Hitachi SCSI
1x160 + 1x120 8MB Maxtors
3.7GHz Prescott CPU
6800NU
Running 2 instances of Prime w/all disks defragging + 3DMark 2k5, my voltages from a multimeter read +11.9v on the 12V (12.2 idle), +5.6v on the 5V (5.8v idle) and 3.4v on the 3.3v (3.4v idle)
One hell of a PSU, although the cables are showing wear from being in a cramped case. (The plastic is popping out of the power connectors). Also, I broke an ATX connector on a motherboard because the PSU's atx cable is too big and bulky. But the mobo survived intact.