the concept is great:if you have an mp3 player of any sort (iPod or other), you have to have a headphone cord running from the player to your head anyway. why not just add a bluetooth headset in the middle of the line and multi-purpose the earphones already in your ears. instantly add stereo to your phone calls and get decent integration with your audio player (the BT325s will mute your player during a call, though it won't pause it, then automatically switches back to the audio when a call ends).advantages over bluetooth earphones: you still get good audio fidelity, you only use the headset batteries when you are on a call, you don't have to have a bluetooth adapter for your mp3 player, just use the standard audio out. the Jabra BT620s, for example, requires an adapter for use with an iPod; the iPod won't fit in most standard protective cases with the adapter attached.advantages over just using regular headphones for music and a regular bluetooth headset: you don't have to take the headphones off to take a call with the bluetooth headset.so again, great concept. moving on to execution in the BT325s. after three months of use:1. horrible microphone. even when i hold it right in front of my mouth, i get reports of sounding muffled, cutting in and out, etc. please improve the microphone.2. only one microphone. depending on how you are wearing it, the microphone ends up on the underside, away from your voice, covered in clothing, etc. there ought to be two microphones, on opposite sides.3. absolutely worthless clip. the engineers of this product obviously didn't test drive it. due to the microphone placement and clip design, the only way to wear it is with a button-front or zip-front shirt/jacket. to run the cord inside your shirt/jacket, you have to have it untucked, the cord is too short otherwise. the clip bends easily and gets loose, then it can't be bent back. it doesn't rotate, so you can't optimize placement. need a durable, spring-loaded clamp-type clip with rotation. the rotation mechanism should have notches preventing inadvertent rotation once it has been set.4. better integration. there really should be a way to not just mute, but pause the mp3 player when a call is placed or received. but this is just gravy. if 1-3 were resolved, i would use this and recommend to everybody i know. as it is, it is going on the shelf.sad to say, i have to call this a waste of money. i really, really wanted it to work.