The C90 does support 1290x1200 on the DVI inputs per the data sheet... But only at 50hz. This will then be down converted before it is sent out the door as the highest resolution it supports, in a premium package, is 1920x1080 resolution. This will all still be severely compressed over the connection which is made and lose a fair bit of detail, but is still a great looking product.
In my experience, severely overpriced for what you are getting and what you are paying for. The Polycom HDX8000 integrators package which includes a HD camera looks phenomeal for the money and is by far a much better valued product with top shelf quality.
Both of these units are working with the ever-vanishing framework which is VTC standards. As industries, and more importantly, the government moves to PC based collaboration systems, the need for the fully integrated CODEC is shifting away.
Obviously it depends on your exact needs, but even going with the C90 is something that almost never makes sense unless you plan on running a ton of sources right to it instead of putting in some sort of matrix switcher ahead of it, which may very well be a far more cost effective and versatile solution.