I set up my first Arducopter APM 2.5 last week and had it flying in 6 flight modes by the next day.
i put it on a 550 hex that i built a week ago with a kk2 controller on it.
My only experience with multirotors was a quad i build a couple of months ago with a KK2 controller.
I was very apprehensive about getting the apm 2.5 because all of the discussion online about how it is difficult to set up and tune.
GPS choices, flight modes, Misson planner, CLI, PIDs, Arduino, power regulators, power modules, IMU, radio telemetry, it was all freaking me out, but i finally decided to order one after weeks of thinking about it.
I was shocked the first time i powered up my 550 hex with apm 2.5 it flew great without any tuning.
I followed the tuning guide and dialed the p and d rates in to perfection using my channel 6.
The guides on getting 6 modes out of my futaba 7c were very helpful, i made a video of my own and posted it.
I also made a video of my 550 flying in 6 flight modes. I did this on the second day after sticking it on my 550 hex frame.
i will put them at the end of this post.
My point is that if there are guys out there that are holding back like i was because i was intimidated by the complexity of the apm 2.5, only because it can do so much, Dont Hold back.
A lot of the blogs out there say to get a Naza because it is so simple to set up and use.
I almost went for the NAZA but i am glad i didn't you will definitely learn a lot setting up the apm 2.5 for multirotors but there is tons of information on diy drones and across the web to get you through.