I'm using one, I haven't really pushed my system though as its summer and too hot w/ no A/C. but it tops out pretty much where the EVGA X58 SLI non LE does from what I've seen, and it looks cool

only real issue I've had is the northbridge runs extremly hot, I'm trying to find a good solution for that but haven't really yet, might end up trying to replace the NB sink with something else, but overall I've been very happy.
edit: check the EVGA forums they have the bigest resouce on the X58 SLI LE that I've seen, not to may other places have to much info as the board was just released 3 months ago in May.