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 don't have it (I do want it, but I have my trusty IB with infinite ammo, so I'd have to juggle them around which I hate) but hell, don't sell it now. Everyone has their coins ready for a surprise like Gjallarhorn. Imagine full raid teams all with fully leveled Gjallarhorns. They can basically obliterate everything, and would take the fun out of the game *pats icebreaker* same for icebreaker :D