I've got two, one from Zmoz's group buy, and one from LED Dynamics. Both are exceptional. If LED Dynamics is sorting them enough to offer seconds, I'd find that encouraging. I wish I could say the same thing for the Epieon. The Epieon, judging from what I received, appears to do the sorting through customer returns. So far, based on personal experience, LED Dynamics seems to be trustworthy in the quality control area.