This isn't an illusion so much as application of physics. I've never really had anyone astonished by this and most figure it out fairly quickly. I have had this illusion for nearly ten years now and I haven't used it in over five of those ten years. The price is good and it's interesting; but it isn't convincing magic. If you are planning on using this in a street magic routine, I'd pass. If you just want to have a little fun with your friends, then this is good for that.
Depends on what you have planned.
Rating: [2 of 5 Stars!]