they are some of the best knives you can buy at any price !
Al Mar passed away but he was the main knife designer for Gerber after Blackie Collins I beleive...If it's an older one made before he passed away it s really worth alot...his wife ran the Co. for awhile and recently sold it.
His kinves usually hold their value or increase with time (and usage and condition)...one of the best ways to maitain the value of a collector knife is to send it to the maker to have it sharpened...
One of his most well known current models is the "Shiva" although I personally love the Roadrunner...but $200 for a new, Al mar fixed sound like a good deal. I had a Falcon folder and the shape of the blade is a work of art.