All of you complaining about what he is saying obviously have never been in business for yourself.
Would you sell something for a $500 profit if you knew 100% of the time you would have hours of service that would be needed on each? All coming out of YOUR pocket? He essentially makes nothing on each of those sales, has a bunch of pissed off customers blaming him for a buggy product, and he came here to vent his frustration. I don't blame him...
Everyone here knows these things have issues.