I have a pair on a 29 Renegade CC. I am very happy with the overall performance. FWC has some of these motors on their Patrol boats & we spoke with a Officer last Summer that had over 1500 hours on these motors. They may use a little more gas than the 4strokes & then there's oil. I don't find my oil consumption that bad. Change oil in the Gearcase every 100 hours & that's basically the maintenance program. It would be very hard for us to switch back to an inboard, just for the simple fact of maintenance free boating.
Fevermike here on OSO had the same boat setup on his Concept