You use a leash. Now you`re really asking for it!

lol
As for the Naish. Well, like with any brand of kite these days alot of people will say

and alot will say

. Your best bet is to try out for yourself.
I`ve flown a helix 12m 08 for the last year and a bit starting from a beginner. And I have no complaints. My progression was pretty quick and easy. Never had problems relaunching, the wind range was very good and controlling the kite was easy. A bit slow turning, but maybe that`s just the size 12m??? One important thing and I`m sure this goes with all the sigma kites is if you don`t pump it up enough it will definitely flap like a sea gull. I`m due for a new kite and now that I`m a bit more experienced keen to try a different make. But you wont believe how many different brands I`ve been recommended and how many brands others slag off. In my experience every kiter is genuinely trying to help. But no two kiters ride, fly the kite, and want the exact same experience from this sport. So your best bet is if possible try a few brands and what ever feels right for YOU is right for YOU. And hey, there`s always next years kites to worry about wich is best, that`s half the fun.