A friend has an e-tec jet unit. A lesson he learned the hard way was that it shuts down if it over-rev's, ie...cavitation can do it, or hitting a sandbar where it may wind up for a second. To get it to run again, he must take it to the dealer to have them "reset" it. His solution is to pay attention and not let it over-rev or else he is stranded on the river...which happened a few times, and it really sucks.
Food for thought.
I dont have a Jet Motor on my etec. Just standard prop motor.. I have been running it a little over 18 months and must say.. It is better than the 4 stroke.. I get about 9mpg with plenty of torque etc... I have used two gallons of oil in 18 months..