Holybro Durandal

Does anyone have experience with a Holybro Durandal? I’m looking for a flight controller for a quadcopter that isn’t a piece of junk. The APM and Pixhawk 1 units I have tried thus far all fall into the latter category. Also, does anyone market a flight controller with a stable version of Ardupilot running on it and who takes responsibility for making sure the firmware and software actually run on their flight controllers?

Better to ask ArduPilot questions at discuss.ardupilot.org
To broadly answer your questions: if the manufacturer is an ArduPilot Partner ( Corporate Partners — Copter documentation ) you can be confident that they test with ArduPilot.