The SL is the closest board in NS's lineup to the Evo and if you are looking for something that will perform differently, especially what you are describing as the "other" style of riding that you want to do, consider the Heritage or even Premier F1.
I see you say you want this board to do flatland stuff, well you either have to put up with the Evo in those conditions, or change what you want to do.
If you have an Evo, the SL seems like a really poor choice as a 2nd board. 5th board, sure. The SL would almost replace the Evo in your quiver, and not augment it hardly at all.
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Last edited by snowklinger; 03-26-2012 at 08:42 AM.