Dynamat worth it ? - quoted $450 from audio shop

nvdave04

So I'm sick of hearing rattles since adding new exhaust and also sick of hearing this crazy loud road noise - I got a quote to have a audio shop use an entire roll of Dynamat in rear adding in panels as well and using 3m tape on anything possibly rattling. He says he has done this job several times on 370z before bc when installing audio it always rattles. He swears this will solve my rattling issue and will be able to actually have a phone call without holding my ear to hear the person talking lol I just think $450 is a lot for this but he said it's going to take atleast 5 hours of labor.. The good thing is the wife is paying half for my Xmas present so that helps - do you all think it's worth it for those who has done this ?