What's your experience with Nizpro Tuning. Thinking about getting a tune for my Yamaha VMAX SHO 175. Is it worth the money?

It makes sense for a high-performance lighter bass boat or other lighter boat, where top speed or close to it matters. For a heavier boat, or one with plenty of cargo or several passengers, that's mostly cruising or transporting I'm not so sure about it. Many mates Down Under have been running Nizpro tuning products for years and have very few complaints. I would try it if I were running newer Yamahas.