I've been an avid user of bluetooths (and yes, that is the correct plural for bluetooth) for a number of years. The convenience in answering speed and the safety afforded in a number of scenarios make using a bluetooth logical.
However, many of the standard earpieces left bluetooth devices too quiet - I simply could not get them loud enough. Many standard earpieces were also uncomfortable for me. I ordered an Avery Sound custom earpiece for my bluetooth and it has been a lifesaver. It is comfortable, and increases the perceived volume of my calls.
The volume is so much greater that I had a problem - it was too loud! I easily remedied this by ripping some cotton from a cotton ball, and stuffing it in the earpiece.