The hyrdrofoil is VERY cool but I imagine it'd only be any good for people in places or access to places with huge waves, not your average Joe, Wouldn't work properly without the adequate speed and enough time to start plane-ing.

Also, I've been hit by someone surfboarding while swimming and I'm lucky to still be alive, I wouldn't wanna get hit by one of those motherfuckers! seems like an option only available to the die hards, with access to empty beaches and big waves OR people who earn their money from surfing and in turn have the facilities to do so.