i have an original dm800, a Vu+ duo and a TM800. none of these receivers is the perfect box, the perfect box simply doesnt exist.
my dm800 runs nabilo bh v12, my vu duo runs vix 2.0 and the tm800 (for these camparisons) runs iQ 15/6. i watch very little TV myself, when the kids aint here, my duo is my mp3 jukebox, my dm800 is my linux - windows file bridge, and my tm800 is what i watch, as i only watch downloaded stuff
the duo wont play any video media from usb, ive tried streaming divx etc, but it needs vlc and stuff installed on the receiver and the PC, and i cannot be arsed. i tried to setup net radio streaming, but it green screens (and tells me to send the crashlog to DMM) every time i use it, its the same with youtube streaming
my dm800 wont play video media from usb either, but it will stream youtube and net radio (i listen to a german techno radio station)
the tm800 has played every video media file ive tried except for one, which was an mkv, but it played other mkv files fine. ive not had time to try youtube or net radio in the last 2 weeks as ive had a lot going on
my duo is in the living room as its twin tuner, which is obviously a bonus, but only the kids use it to watch stuff on. the dm800 is on my bedroom, and gets used very rarely, the tm800 is also in my bedroom, and now gets used as a media player
the duo is a big box, physically, the dm800 is tiny, and the tm800 is in the middle
pvr functions
since UR changed the setup from options to choose from timeshift and recording storage to just a single default device, the tm800 sucks at pvr functions. ive got both my duo and dm800 (and tm800) setup with a 16Gb SD card in the rear, as well as internal hard drives. on the duo and dm800, recordings go to hdd, and timeshift goes to usb, so you can press pause, and its silent (for about 4 hours or so) but the tm800 no longer gives that option
it all depends on what you actually use the box for, good and bad points pointed out above, they all have their pro's and con's, depending on what you want from it