I have a 99' Four Winns Horizon 170 with a 115 Johnson OB on it and love it. Honestly I couldn't picture myself in an I/O boat. with a full load the boat will still get up and go, top end depending on load is 42-44 MPH unless I have my 4 blade on which I use for tubing, then it's 39-40 MPH but I don't run WOT all the time anyway so top end isn't all that important. It's a 2 stroke, so fuel economy isn't one of its high points but lb. for lb. it's much more nimble and has a better power to weight ratio than most comparable sized bowriders with 4.3 V6 I/O... I have a buddy that has a 19' chaparral with a 5.8L in it and I can hang with him pretty well because his is so much heavier... and he drinks more fuel. The extra deck space of not having the engine in the bilge is a major plus too. My only complaint is the lack of more of a swim platform on the back that most I/O offer, but the extra sole space makes up for it.