I've been using mine for over 4 years and it's finally starting to show some wear with the wraparound earpiece, and having a few issues with it shutting off unexpectedly.  All in all, for having it over four years, it's a great purchase.  Although I'm still using mine daily, I'm ready to purchase a new one, and one with a battery is the best, as I simply carry AAA batteries in my car, so whenever this one dies, I just put a new one in on the go.  No worrying about bringing it into the house to charge, forgetting to take it back out, or losing the charging cord.  I love it because it's so convenient and can leave it in the car 100% of the time, so it's always for sure there.