The main issue with reliability is "getting off the throttle too fast". "That is what causes the rotor failure".
This came from the man himself. It can be repaired to a tune of about $400-500 (not positive) but it's not entirely the pumps fault.
But this is hear say from Mike himself, I have no actual first hand knowledge so take it for what it's worth. If the Dragon Flow lays down good #'s without failures I will buy one. I'm still not too sure about II standing behind it. Do a search for II and see what kind of feedback you get. It's not the best reputation out there but they do a lot more volume than Mike does. jmho.