I also saw the series on Mark Evans building the heli and thought "hmm - this all looks a bit too easy", particularly when he appeared to balance the blades in about 15 minutes.
However, the guy who did the test flight didn't seem to be too concerned about chucking it around the sky and seemed to have quit a lot of experience flying them (it must be bad enough flying something you've put together yourself, but flying something some other nerd has created takes pure insanity).
Anyway, shame we can't get the guy who did the test flight to speak up on here and state his connections with the company and then tell us why he doesn't feel unconfortable flying them.
Surely they can't ALL crash