Just found about http://www.rigwarz.com/ My only know-how comes from the forum, but it seems that I found an unbiased opinion about the SP30. It seems that it's doing very good besides all the trolls whining. Only 2 days ROI difference between S3 and SP30. Makes me feel warm and fuzzy inside.

Edit: Well if you add the 12 PSU cost I think that the SP30 might achieve ROI just a little faster than the S3s. Math is nice! Crypto is uber!