Upgrade it now. It's already been buffed, it makes no difference how long you wait. That being said, you'd benefit more from having it fully upgraded sooner rather than later.
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Where does it say xur won't sell the upgrade?
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The Vex is already buffed to 323 or 332 (whichever it is). Do you really think he's going to sell one that increases that? Probably not.
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Edited by Wild Bill: 12/9/2014 2:53:17 AMWhy wouldn't he? The mythoclast was supposed to be the best weapon in the game. Do you really think that legendaries would be better than that, that doesn't make sense to me.
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He will, but for the first week it may be one of the best exotic to use for the new raid.