So used the new system a lot over this past weekend. In Magic Kingdom today we were able to get some pretty good fast passes after our initial ones were up. So we had pre-booked Mine Train, Peter Pan, and Anna & Elsa. We were done around 3 PM (Started at 10 AM and planned a lunch in between). We then were able to pretty quickly get Pirate fast passes. We did Philharmagic (walk on), Carousal (walk on), and Magic Carpets (20 minutes) and then our Pirates (stand by was 40) Fast passes were up. While in line for Pirates we booked Jungle Cruise (stand by was 40) for about 20 minutes later. Grabbed a dole whip and then road Jungle. Then 2 of us grabbed Space mountain while the rest got Buzz for after dinner. Did Presidents and then sit down dinner. Then we split up with our child swap and did space and buzz. Then 3 more did Space with the child swap. My daughter got to ride 3 times because well long story short, she got lost and did what we had told her to do and so somehow when she did space they knew it was her when she swipped her magic bands at the picture spot and led her down a hallway to ride again.
On a side note, while they know where you are in certain spots and when you swipe your magic band, they do not know where you are at all times in the park. They cannot track your whereabouts unless you are actually on a ride or have swipped it recently. As that was not a method to find a lost child and we asked.
Anyway, if we had stayed we could have gotten more FPs, but it was late, I have to get up early to go back to DHS, and losing a child really wears you out. But we could get some decent fast passes after ours were up. As long as you are willing to refresh a couple times, you can find most everything except the super busy ones like Mine Train and Anna/Elsa. However a couple times I did see Mine Train, but it was never at times we wanted that one. But thunder, space, splash, and Peter Pan we were able to get at various times on Friday and Sunday. Sometimes you could grab a fast pass that was starting either then or within 30 minutes. Even Jungle which had a 40 minute line we got fast passes that were starting within a short period after getting off Pirates.
Now I don't think we would have been as lucky in the summer, spring break, or Christmas/Holidays. But I think outside of those times, you can have some pretty good luck with the system.
Also, wanted to add they have shut down the second scan spots for some of the rides. This doesn't reduce costs because at all those points there was still someone there. However it does speed things up. They seem to only be doing it at lower popular rides or rides that the FP and Standby line never meet. So like Finding Nemo, Anna and Elsa, and Pirates are couple examples. They are still running it at Mine Train and BTM. So they are not doing this at every ride. So I think this was to speed things up at certain rides without causing issues since people are not going to care to jump (Buzz at under 20 minute wait) or they can't jump because the lines never meet up.
Memory Maker is all over the place including Small World. And wow, yes, the general public eats it up. Our friends were highly impressed at the Jasmine Meet and Greet that it had their names on some kind of thing for the characters to read and they could see it. They loved it and the kids really loved it. Also, they love the Magic Bands and love how their dining plan, room key, park ticket, and FPs are all on one thing and they don't have to worry about anything. They also love the FP system as it is now vs. the paper system. They come once a year pretty much every year. I think they skipped one year since having Disney age kids because of work (she was not allowed to take time off during a new system implementation one year). Now I will admit that the husband loves to plan things out. So I believe this style systems is perfect for that personality.