If you still have the legacy studio then your fine. You can save with Roles and now use in other options. I havent really bothered since I use ProTools for anything audio. I tend to import audio back into <insert NLE here> before finishing.I'm increasing in temptation to get this. I may wait until they make version 11 though.
What do they provide as an alternative for Soundtrack? It's all done inside FCP?
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If you do the math, Premiere Pro is about that anyway if its purchased in Production or Master CS. Even though I find PPro buggy and the fact that it deals with R3D files easily (we use this most of the time), our facility is Avid then FCP heavy due to its track record.The fact that one of them is only $299 is pretty awesome in my opinion!