I have just removed my boat from the river after my first season and am very happy with the way it has performed with my Epropulsion spirit plus. I have done some very approximate readings on the river that show flat out it does about 5 mph which I think is close to the max hull speed. More interesting is that at 200W you get about 3.5 mph, at 400W 4.0mph, 500W 4.2 mph and thereafter an increase of about 0.1 mph per 100w which shows there is no point in trying to go too fast! I get a good 10 miles at about 300W with at least 25% battery left. I also have bought a second battery for peace of mind. One point worth making is that the battery is designed to automatically discharge to 75% after 20 days of inactivity so it is worth recharging it before setting of to make sure you have maximum range.