I've tried the QuietOn 3, they didn't perform better than foam earplugs. Maybe they were defective. Or not: this reviewer says the same for the older QuietOn 2: no better than foam plugs. I returned them. Now I use old Bose QuietComfort QC20 with a kind of pillow with a hole (I'm a side sleeper), much MUCH better noise cancelation!

they're the bose qc20 earbuds. the sound quality isn't the absolute greatest, but i really do love them for the noise canceling feature.

and im using a generic brand monitor arm for my monitor :P