Performance
The noise cancellation works really well per se, and is arguably better than in previous avatars. The awful pressure or 'pull' experienced by many when noise cancellation is on is definitely there, but in tolerable amounts. This could be due to the fact that the noise cancellation circuitry is at the driver casing and not in a separate box as in other brands and models. But it really helps cancel the noise.
Low frequencies and continuous sound sources are negated, while random waveforms such as speech and high frequency noise are not completely shunned. One point worth noting is that the passive noise reduction of the unit is quite commendable, but then again the music only plays when the headphones are on. When the music is off, the only noises you can hear are those in your head!
Soundwise the bass is quite astounding, with a very low and wholesome envelope, not to mention a smoothly rounded curve. The high and mids are satisfactory too, and it is when the drivers are pushing in full flow that you feel the true performance of the noise cancellation. Passive cancellation is a major contributor to pure sound, but in the end the hollow acoustic environment, occasioned due to the antiphase signal caused by the circuitry, is quite a serious issue.
Conclusion
Overall the QC3 is an interesting product that's poised to be the market leader in this new genre of headphones. However, we feel the tag of Rs 21,600 amounts to mindless premium pricing – even Seinnheisers cost less. (It's small consolation, but all models of this pedigree are a bit pricey.) The sound quality is good though, so those without any budget constraints might want to check it out.
this one is worth every penny. can`t see your disfavour in having a rechargeable battery now. it plays 20 hours before you have to reload the Quiet Comfort 3 and you can it reload anytime. it gives you back some private time while travelling. I just love it. And its just 400 EUR. Thats a great value for the money. 
