Well, an "image" is an operative system: it needs time and exploring and tries to get acquainted to it.
Surely, OBH is more customizable and you'll find out a lot of features, for example, pressing MENU also within specific sections, like the channel list (where you can customize the number of lines displayed, the font size and so on...) or the EPG or the Recording list (where, along with the same possibilities as in the channel list, you also have the chance to assign your preferred functions to the coloured buttons) and so on.