I use the apex. Sharpens every thing from leatherman micra, to a 22 inch serupati.
It is just plain fun to use. You can put an edge within one degree or less over the entire blade. Probably not necessary, but looks cool and lasts forever. Then mirror polish it to just shine.IMHO a great product.
Jim
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What? Another knife? Don't you have enough of those things already?
How many does one person need?
And just what are you going to do with this one that you can't do with the others?
What is the purpose of all these knives anyhow??