I paid $30,000 for my 07 crownline 240 LS. It has a bravo III outdrive. I'd be increasing my investment in my boat by 25% by buying a pair of those if they even made 'em for the bravo III. I'm really struggling to imagine a performance ROI that makes that worthwhile, but maybe it's the miracle prop that cuts fuel usage in half while simultaneously increasing WOT speed and cruising speed and planing earlier and at lower speeds. Who knows?
That being said, I haven't seen the reviews but what I'd need to see to even remotely consider that kind of investment?
Same boat, same motor, configured with a prop that is sized correctly (proper WOT RPMs etc.). Then same for this newfangled thing.
For each I'd need to see significantly decreased fuel consumption and increased top speed with faster planing. In other words, it would have to be better (significantly better) in every user impacting category. If any one of those isn't better, then the other two better be amazing, even mind-blowing, improvements.
In the absence of near-miracle gains, why spend the $$? Spend 8x the dollars for an incremental improvement that can be ruined by one submerged log? Sorry, I'm not that stupid.