all it is , is early access to weapons you may not use at all just like when Destiny launched last year the collectors/guardian editions had early access to the Vanguard and anyone who played day one will tell you by the time your Guardian was a high enough level to equip the vanguard weapons you had already picked up better ones elsewhere in the game.
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I got those vanguard weapons from a friend when I first played. I agree 100%, those vanguard guns were useless once I got high enough level to use them.