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Changing the front is very easy, and doesn't require a chain replacement. Changing the rear has 1/3 as much effect, and only makes sense if you really want to fine tune an exact gear ratio. A one-tooth change won't do much, and two+ teeth requires a change in the chain. Also you can already get various sizes from CSC for $28 each.
From my perspective, I don't see why the rear would be messed with. I did go down a tooth on the countershaft, and that made the bike better all around at my altitude of around 1700 feet. There's a surprising amount of high end power loss compared to when I was riding it at sea level in Los Angeles (where I bought it).
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