So, what I'm about to say, in summary, is that it's a pretty good camera, but I don't particularlycare for it. Here's why.
The G1X is a hermaphrodite – part one thing and part another. It has the image quality characteristics of a large sensor camera (because it has one, of course), but also the limitations of a so-called point and shoot (fixed lens, jittery aperture, fixed step electric zoom). It has the bulk and weight of a compact system camera, but lacks interchangeable lenses and either a built-in or accessory EVF.
Consequently I find that the Canon G1X falls between the cracks. For the $800 which the camera commands (in the U.S.) one can purchase an entry level DSLR or a Compact System Camera with kit lens. Canon's own T3i is one example, though it's bulkier, while various CSC's from Panasonic, Sony, and Olympus all offer smaller size and lighter weight along with interchangeable lenses and superior (though optional) viewfinders.
But, don't misunderstand. There's a lot to like about the G1X. It's well built and has very good image quality. But at its heart it's still a point-and-shoot style camera with all the limitations and foibles that this entails. So, unless one is a Canon G series aficionado, and wants the latest and greatest of that breed, I find it hard to recommend the G1X over any number of other cameras in its price range.
http://www.luminous-landscape.com/reviews/cameras/canon_g1x_field_report.shtml