https://disneyland.disney.go.com/dining/disneyland/tomorrowland-skyline-lounge/
This is my own opinion:
I went when it first opened, and it happened that there were no fireworks that night. In my opinion, it's not worth it. It's a cute concept, but it is expensive for a two-hour stay up in the "mezzanine outdoor lounge area." If I wasn't an annual passholder it would be even less of a value. Now, you do get chargers at your tables to charge whatever phones you have, and you get 1960/1970 inspired snacks, plus there are game boards, Jenga... up there and Mickey and Minnie do make an appearance so you can take pictures. Also, you can play with light sabers up there. However, I can take pictures for free in the park, and get Hostess treats at the store.
If you do get fireworks you'll see a portion of them, and I don't think you'll see projections; and they say that you can leave and come back. If I am paying for two hours to be at that lounge then the only time I'm leaving is to go to the restroom, which you do have to do because there is no restroom up there (that really was a non-issue, though).
Maybe it's fun with a group of friends or that special somebody, but personally, I'd rather put my money towards a nice dinner, Walk in Walts Footsteps tour, or a souvenir. Now, if money is no object then I can see someone who's been to
Disneyland a few times wanting to do something different. A friend of mine went not too long after I did with her daughter, and they both enjoyed it.
I don't go to Disneyland to get away from everyone, so, bottom line, it's not something I'd be willing to pay for again.