Has anyone used "Quiet Rock" sheet rock in room?

Has anyone used "Quiet Rock" sheet rock on the walls and/or ceiling in their listening room? I am building a new dedicated sound room and I am trying to do all the "small stuff" (i.e. clean power and a well built/designed/acoustically treated room). All input would be appreciated.
Also, if you are going to insulate the best option is blown in poly spray foam, next would be blown in cellulose or laying blue jean batts. Stay away from fiberglass for insulation because it's junk.
Blueboard and plaster is better than sheetrock too. More $$ but it has a better finish and and is more solid, not flimsy.
Use tight, heavily weather stripped, exterior entrance doors inside. I've done that and it makes all the difference.
If want Metalica at 120 db and to be quiet outside--full on sound isolation, then separate wall structurs inlcluding Quiet rock (the heavy 160 lb a sheet stuff), floating floor, hung ceiling, windows are possible, but difficult and expensive, double fourier entry studio doors, specialized isolation for all penetrations including electrical and some very inventive HVAC solutions. Build cost would likely be $30k, maybe more depending on location and how complex the HVAC gets. And figure on losing 22" in length and width and close to the same in height to construct what's needed for isolation.

We do recording studies--where it IS Metalica or Ozzy not reproduced--but actually recording and producing music. Sometimes the studio is near a highway--always difficult. Then the same studio is used for a vocalist and it has to be absolutely quiet to hear every nuance--no HVAC noise at all because the ribbon mic will pick it up. The engineering is expensive, the build out is very expensive, but it can be and regularly is done for commercial endevours. It is very rarely done at this level for residential environments, but we have done it for a few clients.
Ha, Funny I just used metallica as an example.. However I don't own a single piece of material from them.. Okay so that was my question meaning a full on application would in fact be pretty serious to fully contain. Yeah for 30 k I would build a Garage in the backyard for 12,000 15 feet away from the house with a dedicated sub panel, just add a heated floor calling it a day! Thanks
Metallica is good head banging,hair pulling music.Assuming you got hair to pull,cause I don't but I am expolring the possibility.My next upgrade is "hair club for men"