These are the guys who I have been working for since February. Mostly building batteries and wiring up the power electronics. I can tell you that the unit does generate sufficient lift to fly, but we haven't done tethered testing as yet. The Hi-Powered LiPo pack I built (3 packs of 28s3p) does work, even if only for about 5 minutes. Should go a bit longer with EIGs.
PS Please buy some options in this company - I need a job!