Should be a good update for first timers, although I do have to wonder if this will hurt phone battery life when the app is open even more than it already does.
Speaking to MM+ in general, i'm coming off a Disneyland trip and I can't quite make out whther I miss the old FP system or not. As a local, I like picking a few rides, going to the park and just doing whatever I want, maybe not even riding those rides. It just gives me options without running around. However, I totally see how WDW's system for FP+ could never work out there.
My mom has been hesitant on going to DL for years since we live here. I finally got her since the 60th celebration is still going on. She LOVED Disneyland. We were there for 5 park days/nights and saw Paint the Night every single night. Saw Disneyland Forever 3 times and WoC twice. I'm not sure i'll be able to step into MK again and look at the nighttime entertainment offerings the same. DL Forever and Paint The Night blow everything out of the water.
To tie it back to MM+ though, as much as my mom ended up liking DLR, I thought it was interesting that one of her main "cons" for DL was that they didn't have the new system or magicbands. She really prefers them. Of course, our case is slightly unique since we stayed at the Grand Californian, so we charged to the room a lot (one of the areas MBs come into play) - Most people don't stay on-site in Anaheim though. Running around for FPs was also a "con" for her, but other than that, she loved it.