Ok, I'm a recreational knife collector.  I carry a pair of Zero Tolerance 0566's daily.  I prefer frame locks over other lock types for most folders.  I consider a $90-$110 range to be "mid-grade" blades and this fits that category.  I like the Arc Lock that is similar to the Benchmade Axis, making it easy to wing this knife open (and closed) instantly with one hand, flick of the wrist.