Saw an item re: Midsize plates that "...adds a full 0.375" (9.255mm) on all sides to NEMA standard-size plates, providing needed gap coverage for overcuts or other large wallboard-to-box openings"
What happened to NEC 314.21? It states that the surface "shall be repaired so there will be no gaps or open spaces greater than 3mm (1/8 in.) at the edge of the box or fitting"
(The kicker is that this was in the IAEI News Sept/Oct issue)