I still haven’t gotten too deep into it yet, but here’s what info I can say for sure.
Buying directly from them was a pain - there are US dealers now that will be faster and easier. It’s a simple unit, small, no moving parts, easy to mount on a tripod with standard female thread. Setup is kind of annoying; I gave up the first time because none of it made sense to me. This guy does a better explanation of setting it up than the manual. Turns out you have to download one app to start setting it up (you never have to use that app again), then you can use the main Anemoseek app to pair it to a rangefinder or Kestrel. None of that process is simple - it often takes multiple tries.
But when it works, it works well. Align the arrow in your DOF and see the wind vector live. It does connect to a MARS WMLRF, but I have yet to use it together to shoot.