Two of our crew came over to the dark side about two years ago. We were up in exmouth for the expo and they were talking to a couple of poleys, the conversation went as follows
the pros were
-gear fits in a car not a van
-need less gear (they have 3 kites and 3 boards between them to cover 15-35 knots)
-need less wind to have fun
-Flat water, and chop were interesting now not just waves.
-easy to jump, and learn tricks
-easy to learn (compared to windsurfing, 12 weeks from trainer kite to upwind, at 2 sessions a week)
-easy to sell old windsurfing gear on seabreeze
the cons were
- high degree of 'plateau-ing', steep learning curve so huge frustration, then breakthrough, then huge frustration then breakthrough, and when they looked back the difference between getting it wrong and getting it right was really tiny, and they couldn't believe that such small things made a difference.
- the need to spend money on lessons, worth it because the coaching you recieve gets you up and running much quicker and much safer but a bit of a ball ache.
Hope it helps but if you send a pm i can put you in touch with them