I would have a guess and say he does not have Snow Leopard yet cause he is asking "should I get it?". And to answer the original poster's question.
Yes you should get Snow Leopard, if your computer is one with an intel cpu. on the surface it is just like Leopard. Just as stable. But much more efficient. More responsive, less bloat (by all the PPC binaries being removed), boot up times are out of this world good, and the price for it is only $30 US ($40 for me in Australia).
And under the hood there is a lot of technical improvements to stuff like the core services of OS X, OpenGL and utalising multiple cpu cores more efficiently. All of this will improve your Final Cut experience. Only a little now but in the future with a future versions of Final Cut it could be a lot.
So in short, I see no reason not to get Snow Leopard. Only 2 reasons would be against it, if your machine can not run Snow Leopard, or you can not afford the disc. And if it's the latter, start saving up for the Disc.

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