ethanol is a problem for all the manufactures. not just one of them so in that case, were all screwed. i work at a johnson, evinrude, merc, and yamaha dealership.
in regards with the 150 etec, GOOD LUCK......i have a 225 right now that needs a powerhead. another customer went through 2 lower units and 3 powerheads in 1 1/2 years and then sold it. trying not to scare you but ive seen alot of issues with them. injector problems and lower units are the biggest issues right now but they have gone with a bigger gear set in the lower unit that is suposed to fix their gearcase issues, so ive been told. injectors are still an issue. the blocks themselves are the same as ages ago back when it was evinrude/johnson and they seem to hold up ok if the injectors would stop failing. suzuki is the best "bang for the buck" NOT NECASSARILY the best in realiability though. they seem to have a problem with cylinder glazing (cylinder walls get a coating on them and the the engine wil not build the right compression, engine wont start), only seems to happen within the first 20-50 hrs so after that your ok. Verados (mercs) you cantr give me one!!! optimax seems to be holding its own and boosts the best fuel economy, period. if have ran the same boat with the 4 engines myself and the opti gets a hair better than the 4 strokes. yamaha 4-strokes and HPDI's seem to be the best. yamaha is unleashing a new 4-stroke thats going to smash it all though, 4-stroke naturally aspirated (no super or tubro charger) lighter than the 2-strokes on the market NOW, better holeshot than the HPDI, more top end torque. if you want to know what engnine is the most realible, go to a marina on the water and you will see 75% is yamaha.
im not a spokesperson for yamaha, its just the truth.... i wish you the best of luck on that ETEC, i just believe youll be saying what i hear about them, its in the shop more than its used.
there "3 year no maintance", read the fine print, if it goes in saltwater, they recommend a yearly schedule.