Ours (Scottish Power) was a walk in the park as you put it since it was internal, but other than not having to have the meter read on a regular basis, it was a complete waste of time! The read out provided is unintelligible. I only tried it on a couple of occasions and rapidly gave up.
That's strange, what display unit did you get given? Ours does current use in KWh or £, use against budget, Use to date, all sorts of handy info. Maybe your unit is faulty?
