Does the job, and good value for money. Constructed using heavy duty plastic casting that's only lightly marked after 6 months regular use on two chainsaws but its probably wise to treat it with care, its not cast iron. The settings and controls are basic, but they do work. It doesn't come with instructions, but its fairly intuitive to see how the chain slots into the guide and then locks into place for each cut and if you are used to sharpening chainsaws manually you'll know the angle settings. Unlike the more expensive sharpeners the chain is moved along manually, and has to be tightened into place for each sharpening action but once this has been done a few times it gets to be automatic. Glad I bought it.