Good to hear, but I really meant acoustically?
The clear membrane roof (ETFE) is fairly flexible, meaning any low frequency noise will just escape into the sky. Higher frequency noises (screaming people) will have a better chance of being reflected back into the stadium, but the ETFE manufacturer's website says it's 70% acoustically transparent, so I think a lot of noise will still escape thru the roof.
The precast concrete bowl is another matter, and as most screaming will be directed towards the field I expect you'll get a lot of noise bouncing around the bowl. Arrowhead has no roof at all yet is one of the loudest stadiums on earth.
So I don't think LASED will be as ear splitting as Qwest or Superdome, which have solid roofs, but I think we can at least get as loud as Arrowhead or better with maybe 25% - 30% contribution from the ETFE roof.