I've ridden the Cult and the Helix's for the last 3 years. I'll agree with Rolavi about liking them with the surfboard but not as much on the skimmer. Here's why: It mostly dealt with bar pressure for me. I like a bit more bar pressure than the Naish's have for skimming. Skimming has a lot to do with small easy kite movements where as in the surf with a surfboard you are more interested in quick turning and depower. I personally needed more bar pressure just so that the bar isn't moving to easily while I'm learning new skim tricks. Think of walking down a long flight of stairs with a railing. it's nice to have a hand on the railing for balance where as not having a hand on a rail can leave you moving around a lot more. So having a bit more bar pressure for me is like that railing. It helps me balance myself. That's probably a crutch but it's a crutch I like having.
I tried the 2010 Naish Charger and moved the trailing edge pick offs all the way forward (most bar pressure) and liked that kite a lot. You can do the same with the 2009 Helix or either of the 2010 Cult/Helix and it adds some pressure. The kites are great and loved them on the surfy but had issues with the skimmy.
I'm now riding the 2010 North Fuse after trying out Cults/Helix/Charger/EVO/Rebel. But looking forward to trying the 2011 Naish line again
Joel with disclosure that I work for a store that sells Naish and North.