"just returned my Q3's and so far I am impressed"4.5 starson by levinej103
Pros: I can tell at least from both the QC 2's and the QC 3's that the noise cancelation is better as well as the sound quality, at least in regards to the bass I agree with the review that the sound on this model is more well rounded in regards to bass
Cons: obviously bigger than the smaller QC 3's
Summary: I have a smaller head so I favored the QC 3's I am a first year law student and I use these for doing work in coffee shops, studying etc... other than the bigger build which I was not a big fan of I can say that it is an upgrade in both noise cancelation and sound quality. Also unlike the QC 3's that left my ears red after long use, the around the ear design is better if you don't want to go into a meeting with red ears after an hour of use, but the bulk made me less motivated to walk around campus in them as my everyday headphones (I know these are typically reserved for flying but they are also great study headphones). Overall if size is not a issue these are the clear choice and they're cheaper. I returned mine on the 30 day money back and the customer service was extremely helpful.