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Are they any good? link
DriverHeaven has released their tweaked version of the nVidia Forceware 78.03 Beta which addressed the shimmering issue. With a rewritten and enhanced Tweak Base so both older cards as well as new ones should see a performance boost.
Unified performance, set the performance slider where you prefer for performance, the set defaults to HIGH Quality. SLI problems should be fixed, 7800GTX/GT Support, PCI Tool Included, Doom3 Optimizations completely rewritten, up to an 11% performance gain reported, Source Engine Optimizations redone, performance gains up to 5% reported in some instances, Full Mobility Support, Negative LOD bias Allowed.
Are they any good? link