We used them (Gregory was our driver) for our trip in October. I loved them and didn't have a problem before. He picked us up, was waiting at the bottom of the stairs at Baggage Claim and brought us right to our carrousel (he found where it would be in advance) I was exhausted and didn't feel well, which he seemed to notice and took it easy on me. I was surprised to have him on the return trip home too - that was such a huge bonus for us (having the same driver)
He also took us out for a night on the town, which was a treat we'd never done. The last people in our party forgot to call him to pick them up for the return trip home (horrible of us, I know - the rest of us took Disney Transport home) but he took it all in stride. He was a complete gentleman and I highly recommend them.