We just got back on Saturday 9/3 with a group of 10. Used ME for arrival and departure. Absolutely no problems with either. It was easy to use and well organized. We arrived in Orlando on 8/28 at 11:30am. We were greeted by many CM's waving large Mickey hands directing us to the ME transportation counter. After check-in, you wait in a que designated with a sign for each resort. There was a Disney CM walking around telling jokes and stories while we waited. The buses loaded with a combo of passengers as they were needed. There were quite a lot of us going to POP that morning, so our bus was only POP folks, but I saw that for some resorts with fewer people waiting, they were combined onto a bus. We departed the airport at about 12:30am and arrived at POP by 1:10pm. Your luggage goes to the resort via a different mode of transportation. We ate lunch at POP's food court and our luggage was in our rooms before we were even ready to hit the parks! (Although we had packed a change of clothes and bathing suits in our carry-on in case it took a while to get our luggage). It was pouring down rain when the luggage arrived and they had it covered with a plastic sheet to protect it, which was a nice.
The night before departure, ME left a hanging envelope on our door indicating what time the bus was leaving for the airport. This will bum you, because they get you there plenty early (we are the cut it as close as possible gang)!

Our plane departed at 7:50pm on 9/3 and our return bus was scheduled for 4:40pm. We flew American Trans Air, which is
not one of the prefered airlines, so we did express check-out (highly recommended) and took our bags to POP's holding area. From there, we enjoyed a park until about 4:00pm. We got our luggage out of storage, gave it to the driver when the bus arrived, and boarded. The return trip takes longer, as we had folks on our bus that departed from both A and B terminals. The B's were dropped off first, then us A's. Again, because we were not on a prefered airline, we took our luggage to the ticket counter, but airport porters were there with carts for assistance. The return was very smooth and efficient.
The buses are new, very clean and comfortable. Plus, they show you an informative Disney themed movie with arrival and departure information along the way. We were very glad that we used ME. My DSis who was with us went with just her family and some friends last year and they used a town car service. She indicated that they got to their resort no quicker by the time you add collecting your luggage and transporting it to the town car pick-up area. She especially loved the hassle free aspect of ME. Plus, there is no way you are going to miss your flight! The early airport arrival ended up being a blessing for us, because there was a problem with our e-tickets which took the airlines a long while to clear up.
Hope this helps!