Have had a play with my Drayton Wiser system for a few days, hub bench powered and experimenting with radiator stat's on my varied makes of existing TRV's, majority of which are quite old "Danfoss RA" units.
Just manually start/stop CH system when hub indicates heat demand/satisfied for testing purposes.
The provided Danfoss RA adapters supplied work very well physically, certainly a lot better than the supplied Tado TRV adapters tried previously, however, don't think the valve is opening sufficiently on demand as the rad's are very slow to heat by comparison to stat's directly fitted (no adapter) to 2 other radiators with cheap generic TRV bodies.
Definately seems to be "Danfoss" pecular as all 3 rad's which have smart stat's fitted react exactly the same way.
Have tried multiple valve re-calibrations.
Have queried the operation to Wiser today, awaiting response.
Hope I don't have to change out the Danfoss TRV bodies, may come to that
Also have a number of old Myson TRV's which will need adapters, not supplied but available third party at £10 to £12 a go, have ordered one to try.
GUI is by smart phone only, Android or Apple, quite impressive but would have liked a PC interface as well.