I tried this box out in an EE store. I found it very frustrating that there is no 'back' button on the remote. You click on something and there's no way out, other than going all the way back to 'Menu' or 'Home' - unless I've missed something.
The big problem with IPTV is that adverts cannot be skipped. I use a Sofabaton X1S remote and have programmed a macro to skip ad breaks. It does 4 x 1 minute jumps forward and I have allocated it to a button on the remote. To have to sit through four minutes of advertising every 15 minutes would do my head in!
How is this for changing channels on live TV? For example from BBC1 to ITV, which on most streamers would require exiting BBC iPlayer and going into ITVX? That is my main inhibitor for going full IPTV at the moment, as there are other people in the house find this clumsy and difficult to grasp...