I've used other brands of document cameras & this is absolutely the best! Compact, lots of features, and very easy to use. I'm a science teacher at an elementary school. I use this in every class to show my students picture from books, 3-D objects, and to demo a procedure.
Biggest issue is that sometimes the document camera doesn't properly connect to my desktop, or my computer switches the HD camera and document camera, so I have to sometimes fuss with it.
A secondary problem is that sometimes the auto-focus fails and leaves me with a blurry image. Restarting the software seems to fix this problem.
All in all, I like this product!