If you want a pure RTF experience fly the NAZA. If you want "damn close to RTF but might have to figure a thing or two out" and heaps more features at a great price, then you can't go past the Pixhawk. Notice I said Pixhawk, not APM. Nothing wrong with the APM at all but for future proofing I'd pay the small difference to have the Pixhawk. It has much more processing power and more memory. New features and enhancements may or may not make it in to the APM simply because it's at capacity.
Having said this. I fly Pixhawk on two quads and in the near future two planes. On my hexa I've gone to SuperX as I just couldn't get it smooth enough with the Pixhawk. On my octo I totally gave up on the Pixhawk and went down the evil commercial closed path of the Wookong. Lot's of choices for different needs and situations. As always, YMMV.
Cheers.