My 13 year old just finished the Live and Learn Press Lapbook for General Science. Although he isn't a fan of science or of lapbooking, he did admit that he learned a lot this year. And, much to my surprise, he requested that I order the lapbook to go along with Physical Science next year. The price is a bit steep, but as I plan to use it with all of my eight children I think I will get more than my money's worth.

I really like how easy the LNL booklets are to cut and assemble. There aren't many shapebooks, so most of your cutting is on straight lines. Although some of the graphics are "silly" the overall look is nice.  I did compare this with the Knowledge Box Central lapbook and prefered the Live and Learn Press overall, though the lab forms in the KBC version are a really nice addition.  

If you're interested in making your own comparison, both companies have samples available.

Live and Learn samples

Knowledge Box Central samples