I have been interested in buying some noise-canceling headphones to use with my Book Port. I want to use these headphones on airplanes and buses to listen to the Double Talk synthesizer read text. After reading numerous reviews on amazon.com, I am still undecided. Many people complain about a pressure on the eardrums while using NC headphones. Can anyone who has used noise-canceling headphones comment on this issue? I don't know if a person can try out headphones in electronics stores. I can reach Best Buy, Radio Shack, Office Depot and Circuit City. Has anyone been able to try headphones before buying at any of these stores or are they all sealed up in packaging? I will list the headphones I am considering at this point. If anyone has had positive or negative experiences with any of these or any other brands please share this with me. Bose QuietComfort2. These are super expensive at $299 and I am reluctant to spend that much money on headphones. They do have the battery for NC in the ear cuff I believe, which is nice. Sennheiser PXC250, less than half the price of the Bose. I have heard good things about the Sennheiser brand. The batteries are in a unit attached to the cord and this may be a slight negative in using the headphones. Panasonic RP-HC100 for around $47 at amazon. I wonder if these have been discontinued since the price cut is so large. They have the battery in the ear cuff but some people have said they hurt their ears after a few hours of use. The Sennheiser PX100 folding headphones, which do not have NC capability, got great reviews at amazon and have been recommended by other Book Port users. They cost less than $50. Has anyone used these on planes or buses? How well do they work in these noisy environments? I also ran across this model: Etymotic ER-6 Isolator for $120. These are apparently in-ear headphones. They are also termed noise isolation headphones and many people think they are superior to noise-canceling headphones. Here is one quote from a reviewer: "Overall sound quality superior to active noise cancellation that unbalances the frequency response." Is frequency response only relevant for listening to music? Most people review these headphones in reference to how music sounds. My main purpose is listening to the spoken word and hearing it more clearly in noisy environments. Any thoughts on this issue would be appreciated. Joni