I also, sometimes use the file to sharpen. but the machine, even as 'cheap' as it is allows the angle to keep the same. Thats a help with the eyes.Nothing wrong with just the file. I did it for years. But with spare chains the machine works best.(holds them in place)
I agree, buy only one spare. I had two, and when I finally went to use it it was brittle for some reason, and it cracked when installed. I took a few of the chips, and along with a simple letter, and the stock number, sent it to HF and they sent me another one. no questions.
In my opinion they have a great return policy.Especially for a big company.
For me, its worth the time to thumb through 15 to 20 catalogs to find the lowest price..once bought a tranny jack that was $189.00 and found it in a catalog for $134.00 (of course it was the last book I looked at)LOL
good luck
Al