Why We Like It
Because it adapts any of your own headphones to the iPhone and you can plug 2 sets of headphones into it!

Summary
Not only does the SmartShare allow you to use any of your existing headphones for the iPhone through the adapter; it also provides a special splitter which allows 2 sets of headphones to be plugged into the iPhone at the same time with seperate volume control allowance for each listener!

Manufacturer's Description
Griffin's Headphone Adapter lets you use your favorite headphones in the compact headphone jack standard on iPhone. Without our Adapter, most available headphones won't fit. And SmartShare plugs two sets of headphones into one headphone jack, so each listener can each set their own volume level you want.