Apparently I've read from multiple sources who believe that the Rough Rider is neither full nor empty, making all of its "active when empty" prefixes completely useless. It's probably a bug, but I think that it should be noted in the Wiki page.
Rough Rider Drop Change[]
the rough rider no longer drops from Erist Mcenforcer as one of his dedicated drops and has been instead moved to the Red Jabber in Embermire. After around 150 kills on Erist not 1 rough rider dropped but after only 4 kills on Red Jabber I had one drop and only a dozen more kills for a sprint rough rider. Updated wiki accordingly.