After trying the device at the World Economic Forum in Davos, Yale Professor and Noble Prize winner Robert Shiller thinks there's still a little more room for improvement.

According to Shiller, Google Glass needs to add an important feature before they can start marketing it as a game-changer. He sums it up in the tweet below:

I try on Google Glass for first time at WEF. I might like them, especially with face recognition, which would really change events like this

— Robert J Shiller (@RobertJShiller) January 22, 2014

In case you weren't aware, Shiller won the Nobel Prize in economics in 2014 for his financial market studies, which helped him successfully predict the dotcom bubble and the housing bubble. So if there's anyone that Google should probably be paying attention to, it would be this guy.

Currently, Google has banned facial recognition apps for Glass, calling them an invasion of privacy. But there are apps for "jailbroken" Glass devices (those that have been hacked free from Google's restrictions).