4 units, 4 units failed to fire up, and I ordered directly form their website that andy pushed. f-them. thats a thousand+ dollars I could have spent on many things that do work. people bitch about the DALY gear, but guess what? there are a lot of folks who use the with no major issues. my only issue is that they do not balance for shit due to passive design, hence my desire to try the balance100's eventually i will get to setting it up and by then they will have either gotten better, or failed and closed the brand, just like everything else from china.