I had recently written a post on the gPC running gOS. Now here is an in depth review of the gOS which is honest,
Despite not being created by Google, the focus of gOS is Google's online applications such as GMail, Google News, Google Maps, Google Calendar, YouTube, etc. It's a neat concept for a Linux distribution.
and quite focused.
... there seems to be no "recycling bin" available on the desktop. I looked in the FAQs and found that apparently the recycling bin is still in development—somewhat ironic given the nature/green theme of gOS.
The downloadable version of gOS doesn't include what's necessary to play DVDs and MP3s. For that you need to install it yourself or get gOS by buying a gOS-based computer.
Written by Jim Lynch at Extremetech, this review gives a very good insight into what you can expect from gOS without taking it for a spin. Has a couple of screenshots too. Read the whole review.