I have existing before buying - read reviews and long wondered whether I should buy or not - mostly negative. I feel that one expects too much from this simple product - sh. well worth the price !! My verdict: - It is a very simple but neat presentation aid that is my claim justice - Battery pure pushed and already runs the part - I have only small lightweight parts that I want back to the viewer in the eye If you want more, must invest significantly more "coal". UD