Hi Jon,
Yes I had an E-Tec 75. Exactly the same physical lump as the 90 but the computer told it that it was a 75.
The plastic on the early ones used to crack a bit but that's been sorted I believe. I had a couple of bits where the paint bubbled but I sorted that.
I found it to be a very good engine. It never played up, was brilliant on fuel and cost about £300 every 3 years for servicing.
The guy that bought Small Fry sent me a Christmas card to say how pleased he was with both boat and engine. ( He's an ex AA serviceman ) so he would pick up on any faults I would have thought !
E-Tecs are not noisey or smelly and run on tick-over quite happily as the oil usage is controlled by the computer.
Thought I would try the Honda this time ( which is also a lovely engine ) but servicing frequency and costs have made me wonder if I should have stayed with the E-Tec.
My view of the E-Tec ? - - - - - -Nothing wrong with it at all ( well no more than any other outboard )
Hope I have been of some help.
Jim