This was a great little gadget for playing fetch with my dog.  The only reason I gave it four stars is that the tennis ball that came with it was destroyed within two throws...it simply broke in half upon landing.  But I purchased more tennis balls from the local pet supply store that are sturdier and they work just as well with the launcher.  The chuckit it is definitely a back & arm saver!  No bending to get the ball and throws quite a distance with out blowing out the muscles in your arms!