We purchased MB+ before our trip in August, but they didn’t work well for us, which was disappointing. For our November trip we brought our older regular MBs (which worked well). While waiting for our room at the Riviera, we asked a CM to check the bands to ensure our passes would “work” with the bands and they checked out fine. We also requested a card key for our room entry just in case. We had no issues on that trip.