I ordered one from Carolina Dronz and tried it yesterday after a .5c charge. It was windy and about 32F. At 6 minutes into the flight coming back into the wind, I received a low voltage warning of 14.3v so I stopped and it recovered to 15v !. As it is new, I'll give it a few charges before passing judgement but so far am not impressed.
It may give longer flight times with no wind and half throttle, but there's no way it should drop that rapidly flying into ~20-25 mph wind, 30+ gusts. I think it is a low c battery with that much voltage drop. It really surprised me.
I've had this happen with the Yuneec batteries as well. Same scenario of flying into wind a full speed on a full battery.