I had an Ivo prop on a Quicksilver GT400. It was great, in fact it still is because a good mate has recently bought the GT (after if left me it went to Latrobe Valley for a couple of years, got a new 447, same prop, then sold to a bloke in Orange then sold onto another bloke back in Victoria, Leongatha and my mate bought it from his estate. It's now at Shady Creek, a place it knows very well since I used to visit very often for morning coffee :)).