We were there over Christmas week and actually found the magic band FP+ system very good and perfer it over the old. The reason being - I can change my FP+ selections on the fly! Loved that! We often are in the parks at rope drop and walk on a slew of rides. For instance my kids rode Everest 5x in a row in the first 45 min the park was open. (DH and I made it 3x, before we bailed) LOL! Anyway I had a FP for Everest already that day, so I just moved it to a later time so we could all get back on after we did some other stuff. And this was when AK had already removed FP legacy from parks.
Another day we were early at MK and rode everything that requires a FP by stand-by walking on and this included several Space mtn rides. We decided we rather do FP at Epcot later that evening - so I changed them all and got Test Track for later that night.
Everyday in the parks I was constantly changing our times or experiences so it better suited to what we were really doing at the time.
Now the only thing we really would have liked would have been to book a FP's for two different parks in the same day. Where we start at in the morning is not always the park we do in the evening. Now I also have to say I really also did not like the tier system for Epcot especially - no fun choosing between Soarin and Test Track! At DHS it didn't bother us as much because we would do FP for TSM and then do stand-by for RNR and TOT when the park opened and could walk on. But it was nice not seeing the "stampede" to TSM upon park opening, felt safer walking in!! LOL!