I've got the Mellows on my bike. They're a good sounding muffler. I expect they will get a bit louder once I add Power Duals in a few months along with a cam change.
I have the power duals also so I'm looking forward to the crushers. Will have them Monday. I have never heard/seen them described as quiet. I even saw a post on another forum where the guy swapped the mellows out because they were so loud. Kind of made me nervous.
Remember as previously said, one mans quiet is another mans loud, so you will find out when you get them...........