The Valkyrie costume set and mission teleporter power will be available to you even if you do not use the Mac game client.
Just be sure to apply the accompanying game code to your existing CoX account so that the new costume set and power is flagged as available for usage by you.
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The Mac Edition is more of a "Marketing Gimmick to Advertise That You Can Now Play CoH on a Mac" thing. It's just another edition.
PC and Mac users each have a version of the client independent of edition, and each user can add any or all editions to their account. In fact, it's best to think of an edition as something that modifies your account, not your client.
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And just to re-iterate, I personally have the Max edition code applied to my CoX account and happily have a character wearing the Valkyrie costume and enjoy being able to teleport directly to those really annoying mission 3 zones away from where you currently are.
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If you dont play on a Mac, and you download the edition from the store, would i still be able to get the costume pieces and teleporter? Or are those strictly for the Mac users? Thank you.