EDIT: I have Gjallarhorn myself, I bought the game two weeks after release therefor missed Xur when he sold it, I got lucky on the witches phase this week and got blessed by RNGesus himself.
I'm just curious as to what the general census would be if he sold it again!
EDIT 2: Personally I would throw my strange coins at him like the dirty whore that he is and get one for all characters.
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I think Xur shouldn't necessarily sell it, but maybe just the upgrade, that would be nice. Either way, the more people that have it, the better the random strike teams will be, so giddy up