I have a 1998 18 hp 2 stroke Electric start Nissan on my 1440 mv joon boat. I love it. It cranks great, has good torque, light weight (weighs only 11 more pounds than an old Johnson 9.9/15hp) and the electric start is great. Back in the day (before getting remarried!), I ran it up to 40 days a year, all in brackish to saltwater & in some shallow nasty muddy clam/oystershell filled conditions. I've changed the lower unit oil once or twice, cleaned the spark plugs about once a season & occasionally greased all the fittings. This summer, I probably need to replace the water pump, its the original. It has held up great to all this abuse. I've never had a problem with it other than water in the fuel tank which messed up the carberator but that was my fault anyway.
My only limited complaint is that on a cold morning, I have to work the choke & throttle for a mintue or so until it warms up, then it runs great. Not a big deal.