That's the same model as the one I bought two fishing seasons ago. Quiet, sips fuel, and very precise throttle control. Mine is on my son's 19 1/2 ft. Lund. At full throttle in calm water it will push the Lund around 5 mph.
The output of the charging system, which requires adding the Yamaha rectifier assembly kit, varies on how much throttle you are using.
I had previously used a Honda 7 1/2 hp to troll on my 20 ft. fiberglass rig, but my son's Lund is about 19 years old and we chose the Yamaha because it is lighter than the Honda 9.9. We wanted to keep the weight down on the transom which already supported a 150 hp outboard.
Price seems very fair to me.