I'd heard several cases of the 800 etecs having the cranks go out, I wouldn't buy one. Last year a buddy bought one, 800 miles it got an entirely new engine under warranty. 2000 miles, it got another one. Totally stock, only used the recommended skidoo oil, and was strictly trail riding (and not even a fast one at that, I have no idea why he wanted the 800).
We had several e-tec outboards in our rental boat fleet and had excellent durability, and you know how people treat rentals. In 3 years(of 3+ etecs in service, each racking up around 750hrs/year), none ever blew up, had one injector go bad, and one coil pack go out. That's it, in easily 5000 hours of combined runtime. In both cases the boat drove itself back to the dock in limp mode.
We also had an Optimax, also a 115. It blew up three times in two years, it never seemed to run right in between....injectors going bad, coils going bad (one had this habit of only malfunctioning on hot days that was throwing us for a loop for days), stator **** out, high pressure fuel pump died, was always finicky about starting hot, tended to stall when it was cold, on and on. I've had carbureted crossflow outboards than ran better than that.