I've never ever been a advocate of kiteboard leashes, in the 8 years of riding I've only ever worn one once at it was at a rather good surf spot where loosing your board involved a very very long bodydrag in (about 800meters).
However, recently I have been entertaining the possibility of wearing one only with a surf board mind you. There are occasions where a loose board is dangerous to other beach users, and the resulting body drag if you loose yoru board is not great for you or the other folks around you.
My question is.....
Have you started wearing a leash for your surfboard, if so then what type, low elasticity would be desirable, so it won't ping back at you. short length?
Im thinking 5' or 6' comp leash, I.E. 5mm core, the risks are still there of course but can they be mitigated, bearing in mind kites these days do not pull you underwater for 5-10 meters every time you crash.
PS, if you start up some rant about leashes and twintips well its not related to the question here, of course that is not ok! I will never advocate a leash for a twintip.