I have used 2 different heads, the Motorola H500 and the Jabra BT250.
Both are excellent headsets, the Jabra being slightly better only due to the fact that it's designed to sit inside your ear, like an earbud headphone, whereas the H500 just sits on your ear, like over the head headphones.
Other than that, quality-wise, they're both very equal. My personal opinion is that it's mostly style and uniqueness that dictate price, not actual performance.