I love my Aqua Jet. I did the upgrade to a graupner 700BB turbo and it screams with 14 cells. I recommend the turn fins and take your time setting them up. Turning is about the only problem with it. Also, buy the flex shaft. The ball joint thing disintegrates instantly and is awful. I just bought a Finedesign SS1 and dropped it into my Aqua jet, but the run times are pathetically short. Need to research this more.