Today I swapped the WKM on my small APV quad for a Naza controller, toughest part of the swap was unsoldering the power module leads from the WKM and then soldering in the module for the Naza, I think it took longer for the iron to heat up than it did for the rest of the swap!
Before I removed the WKM I opened the Assistant software and saved the config file as well as writing down some fo the settings, the goal being to see how close the WKM config would be to the ideal Naza setup. Once the Naza was in place I connected it to the Assistant (different app for the Naza vs the WKM) and did the basic setup and entering the same gain settings where they applied along with setting up the 2 axid GoPro camera mount.
Between rain showers I got a chance for a quick test flight out back. From what I saw on that flight it only needs some minor tweaks to the gain settings and the same for the camer gimbal. For the most part it flew pretty much the same as it did with the WKM, no GPS of course, and the camera gimbal appeared to be working the same. The GoPro video from he flight is uploading to Youtube right now, I'll post the link as soon as it's done.
Initial impression is that the only real difference between the WKM and Naza is the GPS and related functionality, everything else seems to be the same so far. Because it is an APV quad I'm going to up the gain settings to make it a bit more stable and the camera mount needs a bit of fine tuning as well as to be hooked back up to the CC BEC to power the servos. Right now I have it powered from the Naza controller and it's working OK but I can tell the servos are reacting a bit slower than they did with a 6 volt feed. All minor details, the impressive thing was being able to swap one controller for the other and without really changing anything it flew pretty much tthe same way that it did prior to the swap!