They have some inherent issues. I know one guy with a big intrepid with 3 of them. He fueled in the Bahamas and 2 out of the 3 Grenaded on a 50 NM from Bimini to Fort Lauderdale. They didn't cover them under warranty because he didn't use "premium fuel". I've also been told they have issues with the drive chain and sprockets as well as lower units from time to time. IDK.