Sorry, Lots to think about but, at the end of the day "That's just too F&&ing Cool!!"
There are all sorts of issues and of course taking boats from 7 kts where a crash doesn't hurt (too much) to 40 kts (where it could be fatal) is a big deal. The advances in technology are amazing, thinking back to the AC and comparing the advances when we saw the wing keel to now is really amazing. Its hard to believe we are building race boats now that are faster than most of the chase boats and can foil around a race course with ease.
I'll never have one but they are sure fun to watch.