I tried a custom workout this morning and erg mode worked well (tacx neo, Asus zenpad z500m, ticr x - all connected via Bluetooth).
No drop outs, resistance as expected (compared to my power meter pedals - Assimoa duo) heart rate monitor worked fine. So all good from me now.
only tiny issue is if I try and type on a Bluetooth keyboard the screen goes completely blank (well blue at least!) - not really a huge problem as I can just use the on screen keyboard