My set just came in yesterday, after a month of waiting. I got the castings done at the San Mateo motorcycle show by the Ear Defenders guys. Cost for the molds and transducers together: $149. They fit snug, and are still about 29dB of hearing protection, just like standard ear-mold plugs. The transducers are surprisingly high quality for the price. Full and robust bass, waay down deep in the frequency-basement, without distortion. Good midrange, and decent high-end with some slight roll-off. The high-end dampening is to be expected, as the material the plugs are made of is designed to absorb higher frequencies like that. It's a tolerable drop, though, and easily equalized back to normal if your player has even a basic EQ on it. The cords are stout and well designed, with an interesting free-floating strain relief at the "Y" in the cord. They look like they'll survive a good tussling about by either a riding jacket (for a worn audio source) or the environment (if dangling to your tank bag). The point here is to play games with the signal/noise ratio to make music and/or comms gear listenable while riding. Previously I did this by wearing good earplugs (which lowers the noise floor) and cranking normal in-helmet ear speakers way up high (thereby maintaining a good signal level even through the plugs). The downside here is that you're fighting the earplugs with the speakers, requiring a higher volume and thus higher distortion. You're also competing with the wind noise. It works, but the sound quality isn't very good. With in-ear transducers, there's a small tuned-chamber sound port directly up near the eardrum. Your signal level is clear and accurate, without requiring much power at all... while the earplugs still vastly reduce the outside noise just as before. I've never heard such good sound while riding. These things also rock at the office. They're the ultimate way to shut out the outside world, much to the annoyance of my co-workers who have to actually come get my attention instead of shout across the cube-floor. I highly recommend these (or similar brands of in-ear types) for folks who like good audio and want to protect their hearing. If you normally listen to audio in a higher-noise area (server room, jobsite, etc) you have to crank it up to hear the sounds, leading to hearing loss over time. These fix that. Ear Defenders are at a lot of motorcycle shows, but the bums don't have a website. There's a gaggle of ear-docs that do the same thing; you'll find them all over the web. A few companies make transducers to go in them, but the ones I have are <a href="http://www.etymotic.com">from Etymotic</a> and are pretty top-notch.