In early May, I performed a BUIS drop test which was partially published on Military.com's KitUp blog several days ago.
POI shifted 12MOA to the right with the EOTech, POI shift was 1MOA or less with the Aimpoint.
One thing I did not mention in the post which was sent to KitUp (due to word count limitations) was that after dropping the MBUS twice, I picked the rifle up, held it over my head like the maul I used to split seasons' worth of firewood while growing up in Alaska, and swung it down on a concrete shooting table, with the MBUS taking all of the impact. It did not break or shift POI by anything more than 1MOA.
My opinion of the MBUS went from "cool airsoft gear bro" to "wow."
For the record, the only pieces of gear used in this test which were not provided to me for free by a manufacturer or dealer were the MBUS, EOTech, and Aimpoint. The Diamondhead, Troy, and GDI Aimpoint mount were provided by Rainier Arms, Spike's Tactical, and GDI, respectively.