I have a 2013 9m Wave & a 2014 12m Wave
The 9m is an absolute peach, massive range, when I'm flying it, it is directly attached to my brain

I've had a demo of a 2014 12m & 14m Lithiums. Both at the same time and for a few sessions (about 3 weeks)
The 12m was the better one of the two IMHO as you could work it for that little more low down and the top end was better than the 14, no schit sherlock ;)
The 14 was a complete power house, amazing bottom end, turned fast. Was a good kite, but the 12 was better due to being able to kill off the power easier so making it more usable IMHO
That said, I wouldn't mind a 14m Lithium in my quiver, or the 12

I would also like a 14m Varial X in my quiver. Another amazing kite with a massive range. Doesn't have the bottom end like the Lithiums tho' But another awesome kite. Had on demo for a couple weeks
I'm not so keen on the pull and go delta style of kite. I know some are, but they aren't really for me. I prefer the Varial X and wave kites as they respond well to working it and the more you get it working, the better that are. They get better and better as the wind picks up
But Lithiums make good light wind machines for sure
I weigh in at 97kgs and the GF is 60kgs. She flys Varial X, 6, 8 & 10
I would like to change my 14m Catalyst for a 14m Varial X and my Zephyr for a 14m Lithium. Or maybe a 15 VXR (yet to demo)
<edit> (I had the 9m wave on demo for about 2 months. I bought as I didn't want to give it back)