We had daytime tickets for the High Roller on a weekday and rode around 11:30am. Since we purchased them in advance they were $18 - not bad.
The views are incredible and the cell phone shots on Yelp do not do it justice.
Since it was a fairly slow day/morning there were only 2 groups in the pod and plenty of space to share. My one complaint is that the audio (music and narration track) cut-out less than halfway through the ride and never came back. I would have appreciated knowing a little more about what I was seeing.
I'd like to do it again and night but wouldn't do the open bar. Seems like it could be a big drunken mess depending on who else you get paired with.