I can't believe that people on this thred are reccomending a 150 4 stroke over an Optimax 150. I bet they never owned and operated either!
If you are staying in a river or the throttle frightens you then get a 4 stroke. personally I don't buy a v6 to use on a river, If you want to make your spine tingle then get an Opti.
Most people that recomend Suzuki's haven't owned or used one, they just got turned on by the brochure and have one on order or not. So the opinion is not based on personal experience. (Alex B does have and use one)
Most people that recomend Opti's have em and are on the water a lot of the time. So they get used. Also I can't recall any Optiowner slagging them off.
At the end it comes down to power to weight. cost per horsepower and consumption. Optimax's are very frugal and anybody that says different is talking bollix. All engines are thirsty at full chat how does 77 litres per hour grab you from a new 4 stroke yamaha 225.
The only way I would consider buying a four stroke is if I was sponsored!