Griffin Technology's new AirCurve Play for iPhone 4 is a clever idea: it acts like a speaker for the sound coming out of the iPhone, using natural amplification techniques to boost the sound without power or wires, all in a stylized transparent polycarbonate case. But does it really work? How's the sound quality for voice -- or for music? How loud does it get, and where would a user use it? Is it practical, portable, or neither? We find the answers to these and other questions about this intriguing add-on device in our review.
