I’m surprised by the ratings and other review; my experience with Therm-ic heated clothing (and ThermicHeatcontrol) has been excellent.
I use the heated vest and heated socks. Bluetooth control works well and has been consistent for me. The Apple Watch app makes it easy to adjust temperature from the ski lift without having to get my phone out.
I prefer to have full control over my heat settings so I don’t use the eco or motion control modes, but they seemed to work as advertised when I tested them.
Be sure to upgrade your battery packs to the latest firmware if they come with an old version. And if your ski group is waiting for you to get out the door, whatever you do, don’t tell them “I’ll be ready soon I just need to upgrade the firmware in my socks.” :)