I have used them and got some extremely interesting results.
I had a few instances of, um, I guess separating from my body is the best description, while listening to binaural tones. One time I looked to the right and saw a white-blueish forearm and hand hand sticking out and up from my normal arm, in a very awkward position.
Another time I got an odd sensation in my head. I realized it was because my head had tilted up and forward as if I was moving it to get up. Well, as soon as I realized this, it dipped back down and back 'into' my actual head very quickly. A very weird feeling that is hard to describe any better than that.
These were both experiences had while listening to binaural beats, without any real expectations of that happening (I was just meditating with them). Who knows what you may get out of them AP/lucid dreaming-wise. But besides YouTube, there is this site which has all free onsite and/or downloadable tones.
http://iso-tones.com/