Check this:
This device is using an EVE3-50G from Matrix Orbital which has a BT815.
And a little over a week ago I found that the Polyend Tracker is using a FT812 soldered to the board.
Very nice to finally have some more products confirmed, unfortunately these are way to expensive to buy them for just the heck of it. ;)
They did a fantastic job on the GUI, and I have to give them extra praise for the way they did the fade in startup screen.