Where to start with this piece of garbage.
1. Won't connect with Bluetooth to my macbook pro. I have zero problems connecting literally ANY other device to my laptop. I've gone through all the Tacx and Bluetooth troubleshooting steps. Ended up having to buy an ANT+ dongle.
2. Even with the ANT+ dongle, the resistance adjusts incredibly slowly - as in it's delayed by MINUTES from when Zwift or the Tacx app increases resistance.
3. Using the Tacx app it won't go above 250w no matter what. I can set the Watts Setpoint to 500w and the most the trainer will hold is 250w. Before Garmin replies with their non-answer, I know it's a problem with the resistance because I can put my bike in the hardest gear, get it up to the 250w max it'll hold, and then back off the watt setpoint to 150w and the trainer will reduce the wattage to 150w.
4. About 10% of the time the Tacx app will just stop working. Resistance goes to 70w, have to stop my ride, unplug/plug back in and start over.
Buy something else. This trainer is terrible.
Reading these forums it seems I'm not the only one with these problems but Garmin never offers any solutions. Wish I would have bought something else. Lesson learned.