In answer to the spread spektrum optimized GTB question, it's to do with FET switching speed as coSie said. 2.4ghz radio gear runs at a higher frequency, so the esc's FET's switch at a matched frequency which means it responds more efficiently, and consiquently runs a little cooler. This doesn't change the feel/performance significantly, only it's efficiency really.
Standard GTB's are limited on the FET switching speed to better match the lower 27mhz/40mhz speeds of the older radio systems. A standard GTB will work perfectly happily with 2.4ghz/27mhz/40mhz, however the spread spektrum optimized version will only run with 2.4ghz radio gear.
I'm pretty sure that right anyway!
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