This watch winder is everything it is advertised to be and at a very reasonable cost.  I have put this winder through a 2 week test running at 1800 TPD 24/7.  The belt came off just once during this test and customer service was awesome.  The item is very easy to disassemble, and they provide the allen wrench to make it easy for you.  The item is very well designed and made.  During my test I used my Android Volcano and Android 9100 Powerjet.  Both of these watches are big and very heavy but the winder worked extremely well.  Look at the price, look at the colors, look at the expandability, and you will see why I highly recommend this item.  In fact, I now have 2 of these winders and just ordered 2 more.  Each winder comes with an extra watch holder which is nice for swapping the watches.  The holders actually fit in my watch case.  One last thing, even when I have my largest watches in the winder I can still close the front cover.  There is no instruction booklet but it is all LED so you don't need one.  Easy to set up, east to load, easy to program, and works great.