Right, I got myself a pair of these for $75 from JB Hi-Fi and I love em. They replaced my old Sennheiser MX-30's which have worn out with a little over 2 years of near daily use. The CX-300 aren't ear buds, they're canalphones. They sit a little bit further in, in the entrance to your ear canal, and that has it's advantages. The first and foremost is that has the sound re-production is happening closer to your ear drum, you don't have to have the volume up as loud. Which means more time listening to your favourite MP3's on the road. The next one is that because your blocking your ear canal with the 'phone you get sound isolation! With the 'phones in and me screaming down the highway at over the speed limit, the wind is nothing more then a muted whisper. (I wear a KBC VR-1 Euro for reference...). With music playing, you have to listen carefully in order to hear the wind in the background. The sound isolation also means you can have the volume lower and still hear the music very clearly. The third advantage is (and again, it's because of the differences between a normal ear bud and a canalphone...) that as the 'phone sits further in your ear, it's much more difficult to dislodge or move when putting on and taking off your helmet. These are much more comfortable then my old buds and I can easily see myself wearing em comfortably for an entire day. I don't notice em in my ears and they don't push uncomfortably against anything. The final advantage is that the cord is thin, flexible and soft. You don't notice it and it doesn't pull when doing head checks. All that said, the sound isolation can work against them. In city traffic you need to be more aware of what is going around you and the 'phones can impair that. But if you're used to riding with music playing and can make up for the loss in hearing by other means, then these are a great thing! As for the quality of the sound, these are the premium Sennheiser earbuds/canalphones and the quality is great, far better then the others in the same sort of price range. These would have to be, hands down, the best 'phones I've had under the helmet. Highly recommended!