Pros Affordable; Good sound quality for music; decent voice quality; nice size and style
Cons This bluetooth will loose its connection with the phone if you leave the room, turn your head or stick your phone in your back pocket or handbag.
Summary My friend and I each purchased the M155 and we have not found it to be satisfactory, despite the good to great ratings others have given it. The problem with maintaining a connection to the phone seems to be getting worse. It used to announce right away that your were disconnected - that at least was polite. Now there is a delay and sometimes if you move out of range and notice you hear nothing, you can go back and stand over your phone again before it says the connection is lost. That message is immediately followed by another saying its now reconnected. The whole routine is getting very annoying. I'm now looking for a new bluetooth. This one will be a poor backup at best.
Pros Great music quality, battery life bar(iphone 4S) was very useful, great and long battery life. The voice that tells you battery life is exceptional.
Cons The only problem I had was call quality.
Summary This headset if great for portability,music lovers and people who hate their electronics dying often.It is easy to pair and is gret for telling you your battery life.