They last well - I've had mine for years - its normally sharpened on a coffee cup!
I use one of three "EDC legal" knives.
Two blade Ablett - just general use
UKPK. This knife does not move me - its handle is square and uncomfortable. But it has one handed opening. If I'm cutting and closing a LOT (e.g. stringing up netting etc.) the one hand opening is useful enough
SAK. If I'm "out and about" the extra tools (especially saw, scissors, tweezers, screwdrivers) make this my pick
Red