Crikey, 'that' thread on the community forum is a bit of a farce. I long since gave up trying to read the posts.
The UXG-Pro could be a very interesting product, I'll be watching the software releases after they finally reach GA. I'm not interested in RC only releases on a GA product. I do run beta on my APs and switches but I know that I can switch to final releases if I have problems with betas.
If the UXG-Pro has final release software and that software can do the stuff I need it to do (bring up a PPPoE session for example, something that the most recent RC for the UDM-Pro can't do - bonkers!) then I'll probably get hold of one.