We did it this last time. Everything was pretty good, and my son liked the stuff quite a bit. There were only a couple of items of complaint. One was that they stuck a Tinkerbell silhouette on the picture frame that was not part of the frame. When my wife went to remove it (carefully), it pulled off some of the finish on the frame (frame was wood). She called, and they replaced the frame, no questions asked. The other was that my wife asked that they put our names and the year on the Mickey ears, which they did (and it came out pretty good), but on the autograph book, they put "Welcome [son's name] 2012! ... Your Disney Pals, Mickey, etc. etc." or something to that effect on the personalized message from Mickey. I figured that they must have some kind of form that they fill out, and the CM must have put our names and the years for the ears, so they used the same line item for the autograph book. No big deal, but we thought that something worded like that should have raised a flag with the person filling out the autograph book. I'm sure they have to do quite a few of these a day, so they likely don't question it and fill everything out exactly as the form shows.
Other than that, the balloons, stuffed animals, etc. were all very nice and my son was very excited.