I would definitely agree with what These guys had said about the lines etc. I had checked my lines a number of times and they were all equal length but it did sort of feel like the back lines were too long, I then added some new pigtails and it improved the responsiveness and turning speed very well.
I have the 10m noise pro and a 6m noise classic, I also previously had the 8m and 12m noise classic which I learnt on. I definitely notice the difference with the noise pro it is faster and more pivotal turning also the drift is soooo sweet when everything comes together. It has great low end and I find it best for me in its lower wind range, it is quite grunty and gets quite unruly at its top end though.
I also really like the 6m ( really about an 8) this is nice and quick and aswell as being good for the waves it is also a lot of fun for jumping in high winds.
I have dropped all of these kites in the surf pretty badly and never had any major damage my only gripe would be about the bar. It is a really nice clean setup but the safety bungee wears out fairly quickly and the plastic of the chicken loop has cracked on every one of the bars I have had. I contacted them about this issue and they sent me a couple new chicken loops for free (props for good customer service) but I have cracked those also