I could of sworn I replied to this earlier today - but seems my reply vanished.
Anyway - I have a 43' Marine Trader with two of the Volvo TAMD40b (I don;t think you meant TMAD), and they have 4,000 hours on them. I've had the boat for a year, and (knock on wood) have had no problems with the engines. They are quite smokey for the first 30 seconds when you start them, but other than that - they seem good.
I have all the factory / shop manuals for the engine, if you ever need them.