[diver110]

I recently bought the earbuds to check out and yesterday flew with them. The noise cancelling was truly excellent. I felt no need to use my headphones. But after about two hours the earbuds got uncomfortable to wear. I switched to my wired Sony iers and found them much more comfortable and passively kept out about the same amount of sound. I am going to be returning the M4s, but others may not find them as uncomfortable (though Darko Audio did). Note that the original ear tips did not keep the M4s in my ears, so I had to go aftermarket--which worked fine in terms of keeping the earbuds in my ears. If the M4s were more comfortable, I would have kept them.