The H300 Works great with my RAZR and Blackberry. It's loud enough for me at 1/2 volume, and I started my first ten calls with "I have a new headset, does the microphone sound OK?" and everyone said it was good.I like the fact that I can have it in my pocket or leave it in the car without having to plug it in every night to charge like other BTs, and I don't wear it on for long periods of time, so I don't have any gripes about a little extra size and weight for the battery ---and I like knowing that I can swap the battery as needed (I use rechargeable AAA and always have one handy).If I have a day at the office where I need to wear a headset for a few hours and want background noise suppression, I use my Jabra instead (very comfortable and good noise reduction design), but that involves a daily plug-in / charging routine and I've already had to send it back with a dead battery for a warranty replacement ---something that'll never be an issue with the H300.