The ASIair Pro works well in my experience of one year with the Mach2 and 9 months with the ASIair Pro. I do not use a electronic Focuser nor Filter wheel, I have used a ASI 2600 MC camera, a ASI 294MC camera and a ASI 740mm for guiding.
Everything I have used the ASIair Pro to do has worked well with one exception. And to this point the one issue is the lack of ability to set the guide speed of the hand controller to 0.5x Siderial to Mach the mount. Or the lack of guide rate settings in the ASIair to set the guide speed to 1.0x Siderial to Mach the mount.
It is conceivable that it is in either one, hidden in the documents but if it is I have not yet found that capability.
I am impressed with the progress the ZWO team of programmers have made, improving the ASI air capabilities. They have also listened to customer feedback and included customer suggestions in the product. It’s possible they may incorporate improved compatibility with the A-p mounts.