Very handy.  The earpiece is comfortable, works even several rooms away, and voice quality is good.  I haven't yet checked the range of the handset, but it's probably even greater.  The number buttons are very small, which took some getting used to. My only gripe is that if you keep the earpiece on long enough for its battery to run down, you have to re-sync it with the handset by first deleting the earpiece from the list and then re-syncing it.