Well, I got bored of it quite quickly. As a physics concept the car/plane/boat 'handling' leaves a lot to be desired, and as a bendy structure simulation everything is too floppy, bendy and weak... And there is a lot of stuttering - get in the plane on the runway and it sits there nicely oscillating, just like a real plane when experiencing no external forces...
Tried to pick a boat up on to a flat bed trailer, but I couldn't manage it (broke each crane). Tried to fly around, but the wings fall off to easily (and I'm a flight sim lover too), tried to boat around in the speedboat, but just jump left and right 90° over each swell.
Quite good fun for a while though.