"I really like your comparison list.  One correction, the pixfalcon has an on board buzzer.  Thanks"

"Try shorting out the power module connector before each flight.  It fixes problems by zeroing out the bus voltage inside Pixhawk so that the bootup process initializes the gyros and accelerometers correctly. It can help with intermittent compass…"

"Bump, I would also like to know if this is possible.  Anyone?"

"I agree, 3DR does stand by their products and gives great support.  Now my ***Hawk unit is working most every time I plug it in.  I just adhered bubble level on it after a fitful 30 minutes of not arming after a long walk to my favorite flying…"

"I have had the same "Bad Accel Health" issue for 3 different Pixhawks in a row.  Two were purchased directly from 3DR.  The 3rd is a knockoff.  I have tried many different firmware versions without success.  When they boot up correctly, they fly…"