I am very satisfied with this product. It works exactly as described and is cool as ever. I was actually really impressed when I first received this product because it was brighter than I expected. The one downside about this laser is that the cr2 battery that came with it died rather quickly, also the button that you press to turn the laser on is slightly loose, it would be better if it were more sturdy but it doesnt affect the operation of this laser in the slightest. The build quality other than the button is really good. I've seen some people with green lasers that were glued shut and did not allow direct access to the insides. You can take the front part off in order to clean the focal lens and unscrew it giving the possibility to use your own.