I have an 15.5' 1982 Tracker with a 40 hp merc. A very light set up. I noticed when I would turn at WOT the back end of boat felt like it was going to pass me up. I put the Hydrofoil on and my ride is 100% more stable now. I got mine at Academy. Don't remember the price. The only con I'd say was having to drill holes in the anti-cavitation plate to install it. I've heard that they won't make a difference on some motors, but everyone that I know that has one, is pleased with them. Ask the guys on
www.iboats.com forum, they can make sure that you are set up properly and maybe avoid the extra expense.