a mate of mine has a 2line kite and its a gas, use it with the surfboard sometimes and its great for honing certain techniques. Brings back those memories when learning.
I have to agree somewhat with fences, although i think the main thing the new technology is removing is the kiters ability to adapt to different conditions. The new and improved kites allow for "softer" technique, whereas the old (broken apparently?) kites gave you a good spanking if you lost your edge, put the kite in the wrong place. bla blah.
Demo'ed a kite on the weekend in 20-35knot winds, would have been a lot more extreme on the 2line, but then again i am not that extreme so used the 2008 kite instead. I STILL got injured and it is sure to lessen my seabreeze kudos(if possible), but it was a toenail that i lost.