If you've ever owned any of the other FreeSpeak series headsets, you will love the BT500.  It's thinner and lighter than its predecessor, and there's no loss of functionality between the BT250 and the BT500.  Everything that you came to expect with the BT250 is there with the BT500.  It surprises me to see the amount of reviews from people who say the BT250 was awesome but the BT500 is somehow so horrible.