The light show is nice, but the wait to get in ruined the experience. I would have abandoned, but there was no escape route! Obviously the promoters have no way of knowing that half of Phoenix will show up every night.
We really liked the light show, the coordinated music and the event overall was very pleasant once we got in. With the Groupon it made it worthwhile.
The 90 minutes it took from the off-ramp until we entered the light show ruined the experience. Totally not worth it.