Interestingly for a commercial heatsink, Thermolab are pre-lapping the base of the BADA to ensure the three 6mm diameter exposed copper heatpipes are flat, smooth, and ideal for mounting onto the processor. The company call this "super flatness technology", but regardless of the marketing name it's a pretty rare feature for a thermal solution manufacturer to pre-lap the base of a heatsink.
Review @ Frosty Tech