Dave, it is one of the biggest music product trade shows in the world, and definitely the biggest in N America.
mudrummer, cool man, I know a few people that go every year, but I've never been. It's pretty loud and hectic, so it's sort of hard to get a good demo according to many. One of my friends was sitting next to Stevie Wonder on a bench (one of my heroes), and didn't even know it until his friend was enthusiastically pointing at him, heh.
A different friend normally tries to avoid the hectic main floor, and likes to spend time, IIRC, on a lower floor where they have a lot of smaller items. Much less busyness, and some interesting stuff to find, so he says.
Have fun, and report back.