Just got back from a 1 week stay... ended up using Genie + at all parks, but only $LL for FOP and Rise.
We did not pre-purchase Genie, but then had a glitch in my app all week where I could not purchase Genie+ prior to 7 am. The "purchase genie" button would not work. However, once it turned 7am and I could make LL selections, it would let me purchase genie + through those screens. So an FYI if people are having issues.
The first day I didn't know that would work so I tried chat which made me call and then it was a 20 minute wait to talk to someone... but about 10 minutes in I tried to book and LL since I was sick of sitting on hold and it worked. I never got the issue fixed (I had reinstalled the app and downloaded it onto a different device with the same problem across the board) My app was glitchy all week- stupid stuff like the tip board would only say epcot and then halfway through the week it would default to MK instead, so I had to change park every time I pulled up the tip board.
We did get a lot of use out of G+, though didn't try for slinky dog, and didn't need any super early times for anything.
No issues with $LL jumping times for FOP or Rise.
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I had the same issue, the button would show on dd's phone. It was so very frustrating! When I tried to buy in advance on her phone, I would get an error that she wasn't logged on (she was) and I couldn't buy on my phone until 7 am.
I only purchased G+ two days of our 7 day trip. One day for HS and one for MK, and both days it worked really well. I still disagree with paying for "fast passes" and would continue to use it only if it made sense - I did not purchase for your 2nd MK day as it was only open until 4:30 and our 2nd HS day, which was our departure day and we had to leave at 1.
MK, I was able to get LL for Jungle Cruise (1st pick, 3:30), Buzz, Haunted Mansion, Pirates, BTMRR, Peter Pan. That day we rode: Seven Dwarfs, Speedway, Buzz (LL), Laugh Floor, lunch, BTMRR, and then Haunted Maison (LL). We then left to take a mid-afternoon break to the Rivera to explore and for a coffee break. When we got back to the park we did Jungle Cruise (LL), Pirates (LL), Tea Party, Dinner at Skippers Canteen, BTMRR (LL), Peter Pan (LL) and IASW.
I don't remember how our HS day went exactly, but I was able to get LL for Slinky, RnRC, TSM, and Smuggler's Run. We also rode: TOT, Runaway Railroad, RnRC (standby), and Star Tours. We also saw Beauty and Beast, Muppets, and Indiana Jones. Lunch was at Andy's and dinner at 50's Prime Time. It seems like we did something else too.......
I opted to not purchase for AK and Epcot and we were able to do everything we wanted, although we did have to wait in line for an hour or so for Frozen. I also did not buy any ILL, it seemed too high of a cost for one ride as there were 5 of us. We did Remy's and FOP with early entry as soon as the park opened with 30-45 minute waits.