Our Mikuni was a right pain, wouldn't fire up, we were constantly getting the heating plug cleaned or replaced, smoking etc., until a mechanic friend suggested that the alternator wasn't working properly, even on a new boat & then we were charged for a replacement one that was the old one cleaned up, but that's another story. Since we've had a brand new alternator & batteries fitted we have no trouble with it, fires first time every time so long as the batteries have a good charge. We also have a Morso Squirrel for space heating in the sitting area.
In our previous shared boat if the gas went out in the night then the pilot light on the Alde was a real pain to relight, but don't know if that's been improved in the last 10 years or so?
The one thing that I would have now would be a water heater so that we didn't need to run the engine or central heating for hot water.