I've got an E-TEC 90 hp on my 17 BW montauk...you might want to check out my thread on it here:
http://continuouswave.com/ubb/Forum4/HTML/003011.html
It seems to be a good motor, but somehow a lemon got out and I wound up with it. Still breaking in the third powerhead, not content with the 13.875x19 SST prop and have a Stiletto prop on order, not totally pleased with the low end performance but maybe I am overpropped and this will change.
Spent lots of money for this motor (nothing left to fix my old truck at this point but for now the boat is running again); it IS nice to not have a cloud of smoke everytime I start it though. Fuel economy on my whaler beats my old 1986 70 hp Evinrude hands down.
As for no maintenance, my dealer told me although they would cover any problems for the first three years it would only be prudent to at least change the lower unit oil just in case a seal gets whacked by fishing line or whatever. I was also told that an after-market warrantee is a nice thing to have as generally the factory knows what goes wrong while a third party company just asks for some photos... (I wish BRP had some better clues with my motor so I didn't lose so much fishing time this fall...)