I own and perform the Tim Machine as the encore in my walk around act and for other magicians all the time. It is, without question, the most powerful effect in my repitoire. The watch does keep perfect time so you can wear it as your normal watch, which makes it completly impromptu. It takes only a few mintues to reset. You can have it examined if you're careful and depending on your spectators. I will say that it took me a good bit practice to get proficent with it, but the time put in is well worth it. This effect is awesome and Penguin's price is the best i've seen anywhere. If you have anyother questions, email me @
JBMaagic@aol.com. Hope that helps. Jeff