Anyone ever use one of the chainsaw diamond file?

[braggscowboy]

Saw these on ebay and say they last 10 times longer than regular file. I have not seen one. Anyone use one? Thanks!

[ace admirer]

the rotary kind? i used them a decade or two ago.....when i sharpened with rotary burrs... it worked good until the the layer delaminated......seems the kind i used were probably sold under the oregan name...

[Rusty'sDog]

Like anything else, does your usage justify the extra cost? If you are a full time log cutter, it would probably be quicker/cheaper in the long run. If you do occasional pruning on your property, and put away a few cords each year, a good quality metal file should last you years, and can be replaced anywhere. In either case, buy a good one...a cheap diamond file may be no better than a good metal one.
I have never saved a dime by buying 'cheap' tools.