Just tried this as a joke with a mate... and it has seriously backfired. We were floored at the additional bass and scale... just cost myself another couple of sets of u5s... The step up from the 8 Ultra 5s for the Maggie's up to 12 (6 per side) was almost as big as going from the ultra SS to Ultra 5s under the panels.
Improvements across the board and so while the bottom end added a few more notches towards sub bass the mids just got more present, alive and yet even more lush and this is by far the best top end I've heard out of these ribbons. Have been playing some big live recordings and the experience is like being there in the crowd.