I only had the chance to use it twice, and it did a good job! Before I got it I usually did not have bad trouble with line tangle, but when it happened, I was busy for half an hour or more..
Another advantage is that you can set up with little space on the beach, and also connect the lines to the back of the kite, so that the kite is always lying close to the water.
However when doing self launching I would check for crossed lines to be on the safe side, which would kinde defeat the purpose