Only confusing things on that website are that it refers to the video card for the MX version as a PDA-4002, when the actual number is PDA-5002.
Near as I can tell a PDA-4002 is a protective screen filter
Also it mentions DVI as a possible future upgrade when in fact the PDA-5002 has a DVI connector on it already.
I've viewed both of these screens in the same room and lighting conditions and for my money the MX variant was the better screen. The HD version with the tuner box didn't seem to be doing as good a job on the signal processing as the MX version which was producing significantly more information in the darker areas of the image.
Also , important to me but may well not matter to you was the fact that we were unable to get the HD version to accept a progressive PAL signal, progressive NTSC worked just fine, but only the MX version would accept the progressive PAL signal.
The 'umbilical' cord that connects the HD to the tuner box can be an issue for some installations as well since it is 3m long and is terminated which can make it harder if you want to bury the cables in the wall. There is an optional 7m cable available as well.
Hope that helps.