I went to the park yesterday on a one day park hopper ticket (I opted out of Magic Key stuff, and I'm glad I have). It was also our first time using Genie+ and LL.
To be honest, Genie+ was essentially Maxpass to us, minus the big ticket rides. We did it, and we got our monies worth on about 4 rides, which was enough for us. We avoided the upcharges as: we were able to ride RotR stnadby at 5pm with only a 30 min wait (time posted: 60min, the shortest wait time we saw for it all day), did SR for RSR (a 40 minute wait, as the line was back to the 2nd bridge... but standby was 145 min!), and we had no desire to ride Web Slingers. Bonus: we got evacuated on RotR at the At-At room, so that was quite a highlight! They gave us a LL to return, which we did at 7:30pm (as that rides closes early at 8pm). so we got 1 1/2 rides on it.
While we didn't get to ride everything, we got on everything we wanted to (which was nearly all the big hitters) and still have time to do a few repeats later in the night. We had low expectations for Genie+ (and admittedly, it offers many rides that we either didn't need because we hit them early in the morning when lines were already short, or are just not interested in), but wasn't a hot mess, so I'll consider it mostly a success. It is a pain that you can't really select a specific return time, and instead have to keep checking the app to find a time and ride you want. And also a bit annoying you can't repeat a ride. But at least it did work, and it did save us a fair amount of time.
We really wanted to try to see if all the rides that still had Single Rider, but we just didn't get to them all. We can say that RSR and Matterhorn still have it for sure, we used it on both (Matterhorn's has been moved to the right side exit area). Space said their SR was closed this entire week. And Monster's was still offering the Buddy pass. Smuggler's Run was still using SR as well. We didn't get to check on Splash, Incredicoaster, GRR, or Goofy's Sky School.