Like every other system it has its pro's and con's.
I'm back on 5line C's from SLE's and will probably never swap again. Never is a strong word. But I'm pretty confident.
It requiers a certain approach when setting up and moving the kite around on land. But once you get the hang of it, it's not worse then any other system.
As always, knowing your kit is key.
I ride them with my leash connected to CL and 5th when riding. Suicide with a backup... when CL is released all power is lost. Useful for solo landings on water or if things turn ugly.
And I just love having the 5th when it comes to relaunching.
I think that many SLE's lack a good option to flag your kite when properly overpowered. Though there is systems doing that these days, like the ids or 5th on sle's like norths. I reckon the bandits have the ability to flip onto it's back to. Right? Never saw that in real life...
Anyways, I like the way C kites work and appreciate the convenience given by the 5th line. And hardly ever have any problems with it these days.
Did have a few f-ups back in 05 when I first tried it though
my two cents.
cheers
//Joel