First off I've been cutting fire wood for over 15 years now. I have tried out many sharpening devices from the oregon guide that clamps onto your file to the older granberg guide that clamps onto the bar, and also the small hand held electrical sharpeners. None of them were as easy to use as these husky guides. They pop onto th bar and the clear rollers guide the file in the correct downward angle so all you really have to do is keep the file even on the rollers to get a 30* angle on th cutter head. I also noticed that the clear rollers also help to push the file up into the tooth so that you would get a nice evenly sharpened cutter on the top and side. I've been using these for a couple months now and I'm really impressed. I've taken my chains into saw shops and paid $6 each to get them sharpened, and they still weren't nearly as sharp! The raker guage was a nice addition and the size is nice to keep in the pocket of my chaps. These have helped me true up old chains that I thought were long gone and they are back to cutting big chips... not cutting saw dust!
I wish Baileys or Husky would offer these in a 4 pack deal for those of us who need .325, .375, .375 lo-pro, and 404!!! An all inclusive pack would make it easier so you can sharpen any chain. I'm sure it would help sell more of these things too.