I would disagree on the cold air intake comparison as those are pennies on the dollar compared to the $5k per motor propeller. I do agree though with the rest in that I remember when they came out several years and they were all the talk. Now, they seem to get brought up once a year or so and no one seems to know of anyone that's purchased one or has any experience with them, other than hearsay. I guess I'm also a bit confused though as they were all a "pre-order" type of thing before and even now, their "MX series" still has a 30-100 day lead time, which seems a bit absurd especially after 3+ years of being on the market. You'd think for $5k that you'd have something readily available within the week and not have to wait potentially up to 3.5 months just to get your propeller, and that's after having spent $5k per motor on them. Their other version, the "XO", still shows as a "pre-order" status as well, which again seems like it would deter a lot of potential customers who want that instant satisfaction. For me, there are simply too many cons at this point to move forward with something like this. Outrageous price imo, a minimal 15% increase in fuel economy and top speed, no first hand or even forum members with experience, up to a 100 day lead time, etc. That being said, if the prop were to get something like an additional 50% savings in fuel economy, was readily available, had lots of forum members or other great reviews and even if it was still the $5k price, I'd give it a bit more consideration. I'd likely still not go with it because I could get radar and a kicker motor for that $5k price, but I would definitely consider it a little more than I currently am, which is not at all.