Never heard of them before, from looking at the mid to higher HP engines they seem to be a big $ gamble in my opinion, if you gonna spend that kind of coin you could get a proven purpose built airboat engine from WaterThunder, MAST or Treadwell for a few bucks more.
No problem glad to help but you know what's cool is i can save a picture of a boat that's been put on here that looks like it's just been built recently how ever it shows up in my gallery on my phone as a 15 yr old picture now that's cool