Vance 5 lines are great. Pros Heaps of depower and control so avoiding getting overpowered. North 5th depower strap is a little crappy and slips (but no big shakes). Makes your kite more stable and flies better when you have de-powered it, somehow. Cons. If you drop the kite and it flips over on itself the 5th line could rip the kite in half if it relaunches quick.
When i 1st used 5 lines, it made a huge plus to my riding. Confident and comfortable
And they are much easier to land by yourself, even in strong wind conditions.
BUT, as nzglen mentioned, the depower strap slips and is a real @$%#^ when you want to depower the kite. Does anyone know of any fixes for this problem? The Cabrinha BlackTip I had previously had a much better depower system.