I had acoustics fitted at first all-round-replace. Not sure they are quieter, per se, and I immediately noticed a "drumming" not there before ... but I've got used to it now.
Not a reason not to fit them, but not sure they made any tangible difference. To my ear at least ...
I got mine from
www.camskill.co.uk and had the local independent "nothing is too much trouble" guy balance and fit (£10 a corner I think).