Waste of money
I cut 25 face cords last summer using my 028 Woodboss.
Two chains, one bar, one sprocket, and about 6 files and one depth gauge. The chains are still good for maybe one more summer, and I'll need a new sprocket.
All you need to do is set up a sharpening area with good light and that will keep the saw steady. Always use sharp files - when they're dull it becomes harder to take the same amount off each cutter, at least that's my experience. It helps to get the file holders with pre-scored angles on the face, so you can easily line up the file at the right angle.
I got so I could sharpen that chain so that Woodboss could pull through just about anything that wasn't too big for its 16" bar. My sharpening jobs compared in cutting ability to a new chain. I got this saw last year with a box of ~20 used chains, it looks like the previous owner just put on a new chain instead of sharpening! LOL! So at this rate the Woodboss will wear out before I run out of chains.
I tried one of those Oregon file holders that clamps to the bar - what a total piece of ????ing junk. No matter what, it would not file the teeth evenly on each side. After I threw that POS in the garbage I finally learned how to sharpen by hand.
