I just came back from a fabulous week at Shades and the world!
But I have to say I am not liking the new fast pass system at all. Although we were able to get on most rides at least once, we were not able to get on them multiple times as in the past. And I also feel that, because of the new system, rides that usually had little to no wait times now do. For example, Pirates and Haunted Mansion are usually 20 minutes or less. This trip they were both sitting at 30-50 minutes all day every day.
And you really have to hit the FP stations as soon as you get there ... especially at HS. We got there 30 minutes after opening and there were no FP left for Toy Story. We ended up having to stand in line for an hour, and that was the shortest the line was all day.
At Epcot they have a two-tier system for the fast passes so you are only able to get one fast pass in group one, which includes Soarin', Test Track and Illumintations. So you can only fast pass one of them and your other two choices are for things that don't really need FPs to, like Nemo and Living with the Land.
And I found the times to be pretty constrictive since you have to pick the all at one time. Of course, you can change them throughout the day. But that means finding a FP station and waiting in line, again, to change your times.
I just found the whole system to be inconvenient and annoying. Not a "ruin our vacation" horrible, but annoying nonetheless.
BUT!!!! We were at Disney, so we had a magical time!