At least on my game. Been trying since release date to get this damn chest piece and I can't ever get it. Every chest engram has turned to Voidfang Vestments, xur has been selling Voidfang Vestments all the time. RNG is beginning to piss me off so much.
I can't for the life of me even get one from nightfall. I get any other exotic that I don't want.
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I know that feeling. I didn't get my first piece of raid gear until my second run through of CE. I did get the praxic fire from a Xur engram, but mine rolled with a different set of perks, and doesn't have the "spawn with grenades" perk. I never use it.