I took a trip last week up to WDW, and got to experience FastPass+ first-hand. We were staying off-property, so I had to book my choices at a kiosk on the "day of"...

What did I think? Overall, I didn't like it - but the cast members really did make the difference in creating an "okay" experience (as opposed to a negative one).

And to be fair, it was still an enjoyable trip, and we did get to do nearly everything we wanted to - I just thought it did nothing to enhance my visit...and frankly it was kind of a pain to work with.