I guess this thread will run and run with folks posting their good or bad experiences, so here are mine:
I use four ZWO cameras, an ASI 120 mini guide camera, an ASI 120 MC-s in an All Sky camera, and two ASI 178 mono cameras retrofitted with Peltier coolers. I’ve happy with them all, the AllSky camera is out there in a sealed box 24/7, the 178s get a tough time, they are dripping with condensation (externally) after each session, but are now well into their 3rd year of operation.
The only criticism I have is the flimsy nature of USB connection on the 120 mini, but that was easily fixed with a Velcro strap.
I have no experience with the ASIAir, but I bought a cheap ZWO OAG and was impressed with the quality, given the asking price.