I have been led to think that the Pixhawk is the direction I want to go for my 450mm+ builds. I have seen some mixed reviews on Pixhawks, but not sure which ones are trustworthy to buy. Can anyone give some insight on this flight controller? I see many different types & brands selling a "Pixhawk".... here is a few to list. Pixhawk 2.1 by Hex. PX4 2.4.6 by Holybro Pixhawk 4 developed by Holybro and the PX4 team. I am at a loss seeing that their all multiple teams out there making the same/similiar flight controller..