As far as sound performance of the Optimus Micro, it's extremely good. You will find a LOT of rimfire cans that are extremely quiet so 'other features' come into play when making a decision.

Again, I don't like aluminum baffles or whatnot. All of mine have SS baffles. When it's time to clean this makes life a whole lot easier.

I have a Rugged Occulus and I really like that one too. Between the two, the Griffin is quieter on rifles and the Rugged is marginally quieter on pistols. It's not anything insanely 'more or less loud' but you can tell a slight difference.
With subsonic ammo you could shoot those raccoons and they wouldn't even know their buddy next to them just got smoked.