Google glass seems like a solution looking for a problem. Impressive tech, but what is the use case that makes up for awkward controls and two hour battery life

Google glass seems like a solution looking for a problem. Impressive tech, but what is the use case that makes up for awkward controls and two hour battery life? You can strap your smart-phone to your wrist for $30 and get hands-free operation. I am much more excited about self-driving cars. Maybe Google could transfer some of the tech to heads-up displays for drivers.