I have Bose QC2 for 3 months. I think it really good: comfort+good sound+good noise cancellation. I think QC2 has a advantage than QC3: it use normal battery. (another advantage is much cheaper) Cuz you will easily forget to turn off the power of QC, you frequently can't use it for no power. But I have many relatively cheap rechargeable batteries, so I always have power in my QC2. For rechargeable batteries, I suggest "Sanyo eneloop". (You can find some reviews of this batteries on mobile01). In addition, QC2 only can resist regular noise. If you you need extremely quiet, I suggest you can use 3m earplug and QC2 at the same time.