I visited the MK and Epcot on Friday, BB on Saturday and MGM and AK today (eeek, a total Disney weekend, I didn't think of that until now.) So far, I've only seen the one finger scanner at a few turnstyles at the MK. I finally got to use it and the line seemed to move faster than with the two finger scanner. No one in front of me had a problem with it. Instead, at the AK today, every single person in front of me had problems with the two fingers. Most people don't insert their fingers all the way in, and when told to do so, no one squeezes them together to touch the two pegs.