Not a show stopper, but darn unfortunate for a variety of reasons.  After installing the glass PR3, I noted that you cannot easily adjust the middle mass AOSEM  positions.  After a call to LLO to confer, I discovered that they reworked the brackets just before installation of their PR3!  Fortunately they made 1 set extra, so it was overnighted our way.  The unfortunate part is that I need to remove 8 silver plated screws from the awkward position on the inside of the cage over the optic, rework the bracket assemblies, and then reinstall them.  The attached picture shows the "old" brackets - a circle indicates the captured adjutment screw.