I'm looking to buy a multi-rotor system. Been flying helis but multi-rotors are new to me. Want to do some AP with it. Like the altitude hold, waypoints, return home, etc features. Been looking at different units on line, but there is nothing like first hand experience, thus I would appreciate any input. Looking at feature availability, battery capacity, flight time etc. Been looking at Xaircraft 650, Mikrokopter and others. I know a lot depends on camera size as to what size I should get. For those of you that have flown several of these units, which one would you buy? Thanks for any information.