I haven't handled a Premium yet, but I'd love to - overall it's the best looking 457 in my opinion.
It only has two downsides: The stupid, ugly "PREMIUM" laser engraved on both sides of the stock, and, perhaps even worse, the fact that it's threaded 1/2x20 and not 1/2x28 (so it wouldn't fit your Mask unless you got a thread adapter, really not an ideal situation).
This being the case, I'm thinking about getting a 457 Scout myself and then buying a Premium stock someday down the road. The Scout is threaded 1/2x28 already, and since it has a short barrel, the overall length won't become unwieldy once the suppressor is attached.