I haven't yet used the APM(2.0) but was going to do so. My plan is to order the APM2.0 and mount it to a quadrotor.
I'm leaning towards ordering a Mini-Fly Quad from Xheli.com (http://www.xheli.com/09h005-210mm-black-kk-board-arf.html). They are a small platform with the KK flight control board.
Does anyone have any particular comments or suggestions with regard to using this quad as a platform for APM2.0 and ArduCopter?