About the only thing I am hearing so far is it does not work to well on Handheld or Mobile Devices. That's likely because a Handheld or Mobile Device has smaller screens so the image content could be a bit difficult to work around. Where as someone with a PC or a Laptop would not have any issues. Most websites are not very friendly with Handheld or Mobile Devices no matter what layout or format it's presented with. Regardless of what's used it has its advantages and disadvantages.
We'll see how it goes and how well its received over the course of a month or two.