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 picked the first, because if he sold it, I would buy it. But I don't think it would be a good idea for it to be sold. Icebreaker isn't game breaking. It's awesome for sure, but I wouldn't want to turn every boss into a smoldering pile of ash in 23 seconds. Neither does Bungie. They'd nerf it if they sold it.