I don't think I've ever seen one in person but the other day I was on Craigslist and seen a ski boat with surface Drive and had an attached video to show how the boat performed..it looked cool and made a huge rooster tail... he was asking a crazy amount of money for the boat and I started looking around the internet for other boats with the same kind of drive and they were all very expensive also even for the older boats..... my question is why don't we see those drives on more boats and why are they so expensive ? ...what's the pros and cons.... thanks for any input