CG
If you plan on 100 hrs a year that'll be one 50 Hr/6 Month Check and an Annual. At that work on a total of around £1500/yr for the maintenance, plus parts.
As Rod said, if you run more than 30% Mogas then you change the oil/filter at 100 hrs. More than 30% Avgas and you change the oil and filter at 50 hrs. Also sparkplugs are replaced at 100 hrs when running Avgas, 200 hrs when on Mogas (plugs are less than £4 each though - not the £24 for a Lycoming plug...!).
We have 270 hrs on each engine on our P2006T and 100 hrs on our P2002-JF - both since last summer and they've both been as good as gold - exactly in line with what experienced Rotax owner/operators say. We've changed a couple of things on the P2006T but that's to be expected with a new design, the P2002-JF is a well proven design and has been fault free.
The Rotax 912 TBO is now 2000 hrs or 15 yrs. Was it on the company website you saw the old TBO figure?
Pwerformance-wise, the proof of course, is not in the sales figures but how it really flies, and not just how it handles - a study of the aircraft's weight and balance will give a closer clue as to its load carrying capabilities. For instance, we get 100 kts IAS with the P2002-JF burning 16 lph. This is real time, indicated air speed - not TAS at 8000 ft.... Or there's the old trick of adjusting the ground adjustable prop pitch to get good take-off and climb figures and (or...!) high cruise numbers....