Sorry, not tried the 9 or 10 Lithiums
I've had demo a 12 & 14 back to back and found the 12 was the better of the two. You could wang it around to generate power in the low end. I didn't have the wind for a top end test.
The 14 had more bottom end and had so much power. It is on the list to replace my zephyr
Then I had a demo of the 14m Varial X, that is an awesome machine. The top end was pretty good. It is on the list to replace my 14m Catalyst. I remember one day I rode it, it was 15 - 23 mph on shore, the top end was very controllable, not once did I feel out of control (That would be downwind city on the Cats top end). I then let my GF try it, she found the range and flight handling very good. Much, much better than the Cat in those conditions.Then a local teenager had a go, he was on his 9m C4, he was boosting and couldn't believe how good it was. It is faster than the 12m Lithium
I weigh 97kgs, GF is 60, teen is 50 I think
I had tried to get a demo of the 12m VX, but none were available
We had the 12m Wave on demo and bought that as it fitted in well with my 9m Wave.
The 2012 12m VX was a good kite, I managed to take that to Cape Verde with me last Feb. But the wind was cross on, so I struggled getting out back. But once out back it was a damn fine kite. I got further upwind on that than I did on my 14m Cat.
Airush have got better & better year on year. I can not wait to see what they are going to bring out next.