The Sony Ericsson HBH-35 headset is great-looking and very light-weight, easy to use and works with the T630 charger I have. However, the earpiece speaker sits over the ear, not in it, and the plastic housing makes it uncomfortable to wear. Callers complain of echo which seems to be anytime the volume isn't on the lowest volume. This suggests the caller's voice is coming out the earpiece speaker and travelling down the hollow boom to the mic to be retransmitted to the caller.