I have this power supply and it is very nice quality (plus five year warranty). When I upgraded to a quad core with higher power video cards, my Neo 550w supply would not even boot the board most times. I eventually pinned it down to the power supply and purchased this one (I think I paid ~ $150 minus a $20 rebate at that time). I have since upgraded video again and have had no problems. However, I am not using SLI/Crossfire setups - just single slot cards.
I want to pull the trigger on this one but I just spent my month's PC allocation on a new MB.
Oh, the PS is very quiet as well. Gotta resist................