Well, the new owner will have to go with something other than the XR's if he decides to go with 700HP +. Those XR's are time bombs even at 600 HP in a boat that big and heavy. The factory shucked one of the drives while doing prop testing before delivery to MP. Whether you are talking BMax, Imco, Max Machine, Teague, etc. for every story of someone having no luck with them you'll find a story of someone having great success with them.