I am a professional and every year all the chainsaws I have worked with are very efficient, this particular machine is simply useless, just like other models of this specific company that unfortunately I had high expectations for. Whoever wants a machine to last a lifetime should spend a little more and get a Stihl. Otherwise, they can go for a cheap Chinese one. Personally, I have three different models from this company and currently none of them are functioning properly. And to preempt those who might be offended by this comment, all my tools have had and continue to have proper maintenance.