It's an excellent receiver, it works flawlessly with my Taranis X9D on Open TX 2.1.9.
When using the stabilization it works as an 8 channel receiver, but will use 12 channels internally to access the different settings and modes from the transmitter. Because of that, don't forget to bind the receiver in D16 mode with at least 12 channels active, or it will not work.
The stabilization system works well but can be somewhat tricky to setup. the Frsky manual is a bit short about the settings and I strongly recommend to read the RC Group thread dedicated to this receiver.
The FrSky STK Tool (https://www.horusrc.com/en/frsky-stk.html) is also needed to configure this receiver and eventually upgrade its firmware.