I just returned from WDW this past Sunday (was there Sept 14th-22nd). I go to WDW every Sept. The MBs seemed to make the standby lines alot longer than normal. For example Sept 15th I got into the Toy Story Mania line at 9:08am (Eight minutes after park opening). The wait time was already posted at 55 minutes. It took just a little over an hour to get to the point where the fast pass people come in. The CM stopped us while she let them in. I swear there were at least 25 people there using their MBs. Consequently it took us well over an hour to get on the ride, whereas normally if you go straight to TSM at park opening like I did, you get on in well under half an hour. If it was later in the day it would have been even worse, because we would have had to wait for not just the guests using the MBs, but also people holding paper fast passes. I had grabbed a fast pass before getting in line and it had a return time of 2:55pm (again this is right at park opening). That has never happened to me before. The return times have always been in the mornings, (if we grab them right at 9:00am). When I returned at 3:00pm to use the fast pass, even the fast pass line was twice as long as it usually is, due to the people using MBs. Since they are still just testing the MBs and not all the resorts are using them, I was really shocked at how negatively they affected my trip. My wait times were definitely longer than they have ever been on past Sept trips. In fact, I was there in May and my wait times in May were alot shorter than they were last week, which is unusual as Sept is usually the slower time of the year. I really dread it when all the resorts start using the magic bands. I can see wait times being really, really long in the stand by lines.
Oh one other thing: One day I happened to be behind a family that had the magic bands. The dad was laughing about how when they got back he was going to sell their magic bands on ebay. He said that he knew he could easily get $200.00 a piece for them. The wife asked if someone else would even be able to use them. He said' who cares, that'd be their problem. I guarantee those stupid people that stay offsite will buy them'. I felt like tapping him on the shoulder and telling him I was one of those 'stupid' offsite people and asking him how much he paid for their tiny hotel room compared to the what I paid for my one bedroom condo at Bonnet Creek. lol