As someone who’s spent countless time in Sunwell, first collecting transmog pieces on my priest and then farming all the Raiding with Leashes pets; it’s only in the last six months or so, I’ve been clearing the place on my hunter each week. For only a 7% drop rate, I don’t think I’ve done too badly and it’s such a fast raid to clear! You also get the feat of strength once you’ve equipt the bow.
Technically, this is the third time I’ve seen it but not on a character who could wield it. I’m not sure when they changed the feat from owner to wielder but thought it only fitting to become a Blood Elf (for the photo op) since she’s fully decked out in Sunwell pieces.