We enjoyed the lounge last evening. Our reservation was for 8:15 pm and we were taken up and seated immediately. We'd had a late lunch so decided to have dinner there (originally thought we'd only go in for a drink) and ordered the deviled eggs and short rib sliders, both of which were excellent and very filling. Our drinks were the Illumination for me and Gamma Burst for hubby and we enjoyed both. Our waiter was great.
Surprisingly, there were a lot of empty tables in the lounge area. We had a two-top just behind the bar but there were at least 5 four-top tables and a couple other 2-tops near us empty during our entire time there. The restaurant areas appeared mostly full. There were perhaps 8 people waiting in the downstairs lobby when we arrived and we were taken up while they were not. I was wondering if they were waiting for a seat at the bar which was full when we arrived and we didn't really notice any turnover during our time. So either there were cancellations resulting in those empty tables, or perhaps they were not filling up with reservations completely. There appeared to be plenty of staff.
The acoustics aren't great and we found it very loud and noisy despite there being so many empty tables around us but otherwise enjoyed the atmosphere. We'd go again based on the food and drinks but wouldn't necessarily feel the need to go again for the theming or atmosphere, if that makes sense.
We had originally planned to have a drink and then see fireworks, but rather than rush, we took our time enjoying our meal and did not finish up until around 9:15 so missed Luminous. For anyone wishing to do both, I would recommend getting a reservation no later than 7:45 for the lounge which I think would be enough time to enjoy a drink and bite to eat, then get back outside to watch Luminous from the Port of Entry area (as long as you're fine getting out there just before it starts and not worried about how good a spot you find).