I have been trying to keep track of all the kites using this "mini-fifth line, which engages the 2 front lines" safety system. They all look the same, but there may be some differences. I haven't heard of any horror stories about the safety systems not working adequately. So far I know of 4 brands using this safety system, F-one, North, Cahbrina, Eclipse (Morph), and Best will make 5. Someone mentioned that RRD also has one, and that would make 6.
A lot of questions were asked about this type of safety system in the last year, triggered by Cahbrina's entry into the market, in this thread:viewtopic.php?f=1&t=2348879&start=0&st=0&sk=t&sd=a&hilit=ids+system
The Delta design is being produced by more and more manufacturers each year, so I would expect that soon there will be a lot of these kites being used and any problems will be exposed. So far, the kites are not being marketed to inexperienced kiters, and these advanced kiters don't really use their safety systems very often, like beginners do, so it might take a while to gather any adverse-incident data.
It seems like all the questions asked about this safety system in the above link, should be asked of all of these brands, not just of the Cahbrina brand. Does anyone know of any real differences in the functionality of the control and safety systems of any of these brands?
Since all of these systems look the same to me, I am making the assumption that they all will function the same. I could be wrong, and would like to know if anyone thinks otherwise. I haven't heard of anyone who has had a problem while activating any of these safety systems, but then again, I haven't heard of many cases where the kiter, in desperation, needed to use the safety system.