Mine does go quite well with the 25hp although not quite as quick as I was expecting. Didn't seem a great deal faster than when I had the 15hp on there
Haven't had chance to check the speed on the GPS yet but I don't think I was doing much more than around 20mph(2 up, no gear)
I'd like to try a larger diameter or higher pitch prop to see if that makes any difference (currently a 10x13), the hole-shot was almost imediate and shouldn't have a problem towing a wakeboard but top speed wasn't too impressive and it seemed to get there way too soon.
Anybody have a used Johnson/Evinrude spare prop I could buy/borrow?(she's a 25hp '89)