I haven't played GX, but I hear good things. F-zero X on N64 was absurdly awesome, and crazy fast, so if GX manages to hold up to X then yes, by all means get it.
Personal Note, the original F-zero on SNES was on of 3 games my dad got me with my SNES. Also got Super Mario world and Roger Clemens baseball. I loved F-zero almost as I loved Super Mario World as a kid. Such an awesome series.

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