Differences between the versions:
All four boxes seem to be exactly same hardware with the following feature differences from the Homatics Box R 4k Plus:
The Dune HD Homatics Box R 4k Plus is black, but appears otherwise identical. Dune does offer a special "Dune HD" app that is unlikely to run on the other versions.
Nokia 8010 is black in a different case, has larger backlit remote with number pad, dedicated play/pause, FF, RE buttons.
Rocktek G2 is black in a different case, has SD card slot and has larger remote with number pad (NO backlit and NO dedicated play/pause, FF, RE buttons).
note: Homatics does offer a premium remote similar to the one that comes with the Rocktek :
Premium Remote