I have it about 4 years now and have not had an iota of difficulty with it…chains are cheap too… 3 sets for $28-30.00. They last, easy to touch up with a round file and easy enough to change with that Quik-release system they haveI plan to get a similar saw. My brother purchased a ms170 a couple of yrs ago and is a de-light to use. At a couple hundred bucks, it seems to be a hell of a deal.