I have a Big Dog Diablo(made by hustler) that has the 35hp Kawasaki on it and I love the mower. Its rated top speed is 13-14mph i believe but as a growing lawn care owner I honestly dont have not one account where I can mow that fast. Either the property is too rough or to many trees, bushes etc....Honestly even if I could I cant see me ever mowing that fast on any property. There are alot of good mowers out there but for anyone to say one is better than the other is all a matter of opinion. I have run Ferris, Grasshopper, Toro, Scag and all are quality machines but it really just depends on what situation the mower will be used.