"Andre, Interesting, thanks for the link.  Nope, ditching wasn't because of the ESCs.  I've always had good luck with Mikrokopter, and I did have 5 good flights before the odd behavior.  PWM would require a lot more wiring, and if I can, I'd love to…"

"Flew the Pixhawk with the Mikrokopter ESCs yesterday (6/26).  Aside from some tuning, it was working as expected.

I tried to loiter around a point (5m radius, indefinite time), and while it did perform that maneuver, I couldn't get it out of the…"

"Andre, That's what I thought you were talking about, just wanted to make sure.  Nice history lesson.  Likewise for me, I've never had any problems.

Marco, Just throwing this out there, is there anyone else who has the MK stuff working with the…"

"Andre, what do you mean when you say there are at least two hardware versions?

Marco, what MK bl controller are you using?  Are they individual ESCs, did you solder them, or are they a power distribution board?  Sounds like there's some sort…"

"Yeah, I totally agree.  The mkblctrl is a good start, but could use some additions.
I agree with you, reliability is the most important.  I'll give things a try and see how it goes."

"Interesting.  With the Pixhawk, running the PX4 flight stack and the MK I2C ESCs?
I'll keep that in mind and I go along."

"I believe it's supported since 3.2.  I know it talks to the I2C, since the motors _do_ spin (and I can control the speed with the RC TX)

Worked on this yesterday, and here's what I did to get the Pixhawk working with the MK ESCs:

Switched to using…"

"I've appreciated all the comments on this thread, it's helped me to get where I currently am.
Where am I?
Old Mikrokopter Hexa-XL
MK BL-CTRL 2.0
Pixhawk w/ APM flight stack running ArduCopter V3.2.1 Hexa
I2C cable running from MK BL-CTRL to I2C…"