At level 110 they drop iLevel 820 gear than can be warforged, in addition to lots of Artifact Power. I had an 835 pair of boots drop, a lot of the gear was weapons that we wont use, guess they are leaving those in.

They are also easy. It is BC dungeons and I was able to pull many groups at once so things went fast. Still seems easier to do World Quests for gear but there is the weekly quest that probably gives something good.