It's probably the same quality as listening to a factory corolla car stereo... it's alright but it's not breathtaking.
I use mine with my Nokia 6275i mp3 phone and it works good but I'm trying to sort out some sort of handsfree set up for myself for answering calls.
At the moment I plug the Audex straight into the phone with the help of a 2.5mm - 3.5mm jack converter but this leaves the problem that if someone calls me, and I answer, they won't be able to hear me unless I unplug the headphones... because the stupid Nokia disconnects it's own mic when there's a headset plugged in.
This isn't good coz it's pretty hard to unplug it with gloves on, so I'm gonna get out the soldering iron and see if I can sew a Nokia microphone into the front of the Audex Ear Pads.
Still don't really know what I'm up to ay, it's all messed up coz I bought a Nokia headset (with a mic) thinking I'd be able to cut it up and rewire it and shit but the problem is that the headset I bought is only Mono sound, and it plugs into the "pop port" on the bottom of the phone instead of the headphone jack.
So, I can plug the Nokia (mono) headset into the pop port, AND the audex (stereo) headset into the headphone jack... and then I can listen in stereo AND talk through the mic but for some reason when they're both plugged in like that, the little "Answer/Hangup" button on the microphone doesn't work anymore.
Might have to go out and buy a different Nokia headset that has stereo and a microphone (I was drunk as fuck on saki when I got the mono ones - didn't even remember buying them). That way I'll be able to just cut the ear buds off and solder a wire on that will plug into the audex...
My other brilliant idea is to buy a Nokia HS-81 headset which is actually made by seinheiser and then take the Audex Ear pads apart and replace the speakers with seinheisers and a mic. Tho I've read somewhere that these only work in mono on my phone... haha, longest message ever.