Back in the OLD days when doctors made housecalls and carried that top-opening doctor's bag they carried that knife.
They used the knife, edge-up, to count pills out. They used the long thin blade to shovel out powders from bottles to mix with liquids.
The spey blade could be used as a scalpel in a pinch.
The ass end of the handle was used to grind pills up into powders.
I like them. They have a nice, long, thin 3" blade but have a really thin overall shape that carries easily and is easy to fish out of a pocket full of other things.
They're handy! With such a thin profile and an over-all length of a little over 6" they're good for when you want a long reach. (Like fishing your keys out of a urinal, poking at something to see if it's dead, or anything else you might not want to use your fingers for.

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I also like them because I bite my fingernails and I can pinch the knife open without using the nail nick.
They fit perfectly into a watch pocket with enough sticking out so you can easily get it out.
Buy one and try it. Everyone should have one and most of them can be had for less than $40.
I have a Yellow Delrin handled CASE for sale or trade cheap if you're interested. (I have 3 and I don't need that many.)