Wow! I think that this is a must have! I've been wanting to drive a Quad and a Jetski. And with this Quadski, it's like hitting a two birds with one stone. I've gotta try this! Thanks for this hunt @whoarewe.
Pros:

• Jetski and Quad in one
• it transforms in seconds when you go to water from land or the other way around
• BMW engine
  Cons:
• none that I can think of