I have a fletcher arrowstreak, but with an inboard. Its certainly a fast boat, much, much faster than my old rib. But, on a choppy day, you barely want to go above displacement as the ride is so harsh. I've opened the taps before in a moderate solent chop, and whilst it will go at a hell of a clip, you spend a fair amount of time in the air/peeling yourself off the dash. Maybe it could be a race, but with time penalties for every slipped disc you end up with? It also absolutely loves petrol, and drinks it at a maddening rate.
As the others have said, either chose a choppy day (he DEFINITELY wont want to open it all the way if hes new to boating!), or set a course just long enough that his uneconomical 2 stroke empties his tank.....
Best of luck and enjoy!