How Good are the DNA-Drivers for ATI Cards?

dark_requiem asks: "I've been digging around online to find some way to pump a bit more power out of my Radeon 9800 for Half-Life2, and I ran across DNA-Drivers. According to the developer, these are hacked versions of the official Catalyst drivers, optimized for speed and image quality. I've been trying to find a good review of the performance of these drivers, but haven't found much. Has anyone tried these before? Are they stable? What kind of performance advantage do they offer?"