The 531 Pardue is ultra-lightweight and very thin, you'll hardly even know it's in your pocket. The black and gray herringbone G-10 handle scales help keep the knife's weight down but keeps it very durable. The AXIS lock, dual thumb studs and reversible pocket clip make the knife usable for right and left handers. The Pardue 531S has a stonewashed blade with a partially serrated edge.
I loved the old Benchmade 530, it was lighter and thinner than this 531; but, to be honest, the improved materials in the handles and blade steel on the 531 make up for the slight increase in bulkiness. Fit, finish and action all all up to the typical Benchmade standards. 4-1/2 stars. I would say 5 if it came in the old 530 blade double edged (1 side false) shape.