For the price of 20, - the microscope is good. The resolution of the sensor is only 640x480. From the description that is not apparent, however. The stator is made of metal, but much too light. The zoom button does not function. The included measurement software is out of date and must under administrator privileges to run (Win 7 64bit) as it crashes otherwise.
The microscope works without installing drivers. As software I recommend ToupView by the company ToupTek. It is free and shoulders above the bundled.
Price / performance is OK. The sample images created with the software ToupView.