I recently purchased 2 VMX 100's because I think Sennheiser makes the absolute best stereo headphones. I was extremely disappointed by their VMX Bluetooth. I did everything possible to turn up the volume on the bt as well as my phone and still could barely hear. Also, it was quite "clunky" on my ear (it actually really bothered my ear and after taking it off, it took a little bit for my ear to adjust). I do not know if this is because I am a female and have smaller ears than a male. My friend I gave the other bt to did not have the volume problem. She did have the problem of it not staying on her ear no matter what she did...she almost lost it out the car window! She also had issues of it not always working.  PRO's: Easy to use (if you can hear it); FAST charge; carrying case with the vmx 100B is nice (however, the company is not expected to get replacement cases until the middle of April); background noise was very little when listening to my friend talk on hers; sound quality when listening put the motorola to shame! I am now going to try the Sennheiser FLX 70. I will let you know how it works out! IF YOU READ THIS, PLEASE CLICK AT THE BOTTOM AS TO WHETHER YOU THOUGHT IT WAS HELPFUL OR NOT! THANK YOU, I APPRECIATE!