Or cigarette lighter fluid. Don't smoke while using it tho...

Great question. I go toward the quality (and design) of the more expensive tools.

The other advantage of Leatherman or any other name brand (Gerber, etc) is they have gone through several designs; they are better than the same tools ten years ago. The cheapie knock-offs never do that.

Teacher

PS If you need several tools, go the Ebay route.