Ok so I'm not sure I buy the whole less noisey part to be honest. I've shot my 45 Auto 1911 with two different 45 Cal Suppressors and it was very loud. Like hurts my ears, loud.
My 1911s, P220 and 2 CZ 97s with a Rugged 45 can, the sound of the bullet hitting steel at 7 yds is louder than the gunshot.
Outside, don't even wear muffs, now inside not pleasing but tolerable.