Instruct: Classify Amazon reviews into positive or negative sentiment
Query: useless noise canceling, ok headphones

When you turn on the noise canceling feature you can hear a very low rumbling sound. I tried these on an airplane and several other white noise environments, like fans blowing. When comparing these to regular headphones, there is no difference at all. A coworker let me try his Bose noise canceling headset and that did make a noticeable difference. The noise canceling feature of these Philips headphones appears to be worthless.The comfort and quality of these as just regular headphones is ok, but why would you buy these unless you wanted the noise canceling feature?