My engine may be smaller than what you are looking at, but I chose the Etec 25 2 years ago as a replacement for my old Yam 2 stroke.
It has beeen great, although despite the long service interval (300 hrs) I had mine checked the first year and serviced this spring at around 150 hrs and a few bits changed, just to be on the safe side. Mudeford shallow water "mud" will contribute to wear if you are based around there.
It starts first time every time, even after winter, uses little fuel and oil, and is much quieter than the old 2 stroke.
No complaints from me.
Check out where you would have it serviced though, as support in marine services is overall poor in my experience.
Clive