Hi hwh,
Thanks for the history update on the CC3D. It's strange that Cleanflight was able to provide Altitude hold starting basically from scratch but so difficult for Librepilot. As far as the prices go, in Canadian dollars CC3D $18-20, Revo $60-69, and the available Revo boards have many reported problems with voltage irregularities and bad/inferior sensors. Also, the Naze32 Flip is out there with good quality reports working on Cleanflight and only $34, half the price of the revo, with similar specs.
Don't know what CC3D enhancements Librepilot have made as mine are all running nicely on OP, but it doesn't look like the enhancement I am looking for is going to happen,
Cheers!
Cole