I received a Pferd 2 in 1 sharpener for Christmas. It's exactly like the Stihl and I'm sure it was purchased on Amazon. I've always touched up my chains with hand files but the tendonitis and arthritis really makes it painful some days. I've used the Dremel with the guide and it works well but my Dremel has a cord. I tried out the Pferd sharpener yesterday and it's pretty good. The way you hold it makes it easier on my hands and wrist. It does make it simple as it files the rakers down at the same time as you file the teeth. I clamp my saw in a vise when I file which makes it easier for me. It is kind of pricey which is why I never bought one but I will say it works good and it is easy to hold the angle with it.