This is my second pair of Tech 8s, the first pair lasted 10 (yes 10) years. I liked the older bootie a little better because it was easier to get back into the boot than the new ankle-and-last style. The old bootie also gave the boots a more plush feel than the new style. Not sure why these are called "light", the weight feels identical to my 2002 pair (I didn't put them on a scale to weigh them though). A nit about the old boots is that the white plastic yellows and disintegrates over time.
I brought my new pair on a 2 week riding trip to the San Rafael swell area in UT. They broke in quickly and were pretty comfortable right away. Even on my last day and after +1200 miles, they were still very comfortable. The new buckles snap down nicely, but I did need to pry a couple of them open at the end of the day a couple times after getting stuck in quicksand earlier in the day. Probably not something many of you will worry about!