For what it’s worth - I found setting up Zwift with my Computrainer on my Mac a breeze. It took minutes whereas with my PC and Racermate software took me nearly an hour. (Though Zwift with the CT on a PC was similarly easy).
You do have to do the regular calibrations with the Computrainer though. Make sure you follow their instructions to do so. You can do it without Racer Mate software. Do an easy spin around the island for 10 minutes, then do the calibration, then ride on.
I found that my calibration on my unit drifted enough from week to week that I thought something was wrong with Zwift or that I was getting really weak. If you can get your rolling resistance number in calibration between 2.5 and 3, you’ll be pretty realistic in Zwift.