I'm pleased with mine. The rechargeable battery life is great. After a recent 7 hour flight at 5 minute intervals, the battery indicator said 93% remaining at the end of the day.

Only four stars here though. Typing a unique message without the smartphone link using the rocker switch is just horrendous. They could have done better in that department. I suppose it's a good thing that at least the capability is there if the phone is dead or absent.