It does work but it is a weird, funky design. I had a used copy of this set awhile back. If everything is in good condition, it works. If the finger hinges on the "scoops" are loose then you are going to get erratic shots and if the technic pins are too tight or stretched out then it won't be very powerful. But you can always change out those parts to get a used up copy working again.
My biggest problem with it was that it is very awkward to fire. It is hard to hold the base steady and move that dragon head down in a quick, powerful motion.
Hope this helps!
PS. The title of this post is very vague. I'll edit it, but in the future can you make your title posts more in line with actual subject of the post? Thanks.