I have a 2016 21 SLX on 25" tubes with a 90 HP yamaha. Will hit about 27-8 MPH with a light load. We don't ski or tube so power was not an issue. Still gets us to where we want to go in a reasonable amount of time. I look back and sometimes wish for a 115 but really not something i would pay extra for. We are going on season 3 and love the boat and it does exactly what we wanted it to do, that is get us on the water and cruise.