I have owned them all. The Zero UAV was a science project gone bad. They were not up front that you had to jail break your phone to make it work. OP is dependent on a group of dedicated volunteers to make the project work. It will eventually happen but my patience is not that long. Pretty much the same for the Ardupilot, many promises and very few actual advances. I sold all of them, with the exception of the Revo, last year. I want to fly not futz, and yes I know my copters inside and out. Don't dismiss DJI products because they are easy to use.
Same here, I have them all but always seem to come back to DJI in the end. I recently bought the latest Tarducopter boards and was disappointed by the lack of progress in terms of stability since 2 years ago. And it still has bugs. A good cheap and reliable board is the Afro32 from TC. I'll be running that on my endurance record attempt. (tricopter).
I have three axis Phantom with two 2800 MaxAmps which gives a safe 20 mins.
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