Customer service is great. However, wearing them the minute and a half to try them on, my foot pain melted away, so I decided to keep them. As for the sound, I didn’t notice total noise cancellation like I do with my Bose, but obviously there are several hundred dollars separating the two products. I spent $15. They both work well. I decided to hunt for a Finalmouse Ultralight Phantom for the weight, precision, and so on. 4) The rubber on the bottom is not crazy thick - ya know the kind of sole that makes you question why the slipper is a slipper and not a shoe since it looks/feels/acts like a shoe? Not these, thank goodness. The package arrived and fortunately there was an outer tough shipping envelop, as the interior box was pretty much mangled in shipping; as such, the sandals were pressed together so much that, after a week, the first strap on one still is pressed down, so they do not permit the foot to "slide" in as easily as expected. Another reviewer said it perfectly: return this pair and invest in the real leather ones for $135. Sizing.