The 40Z5800's onscreen menus use the icon-heavy, double-axis system we've seen on a number of previous Sony TVs – and it's a system we generally like, aside from the fact that it takes a little getting used to when you first get the TV.
The remote control is a pleasant enough device for the most part, with our only niggle being that the circle within a circle design at the remote's heart can lead to a few wrong button presses, especially if you're using the remote in the dark.
We also found ourselves a little confused initially about which digital tuner we were watching – Freeview or Freesat – at any given moment. The onscreen labelling should definitely be more helpful in this regard. But again, this potential for source confusion reduced over time, as we got to know our way around the TV better.