I just went to the PMA show today and I got some hands-on time with the EX1.
First off let me say it's actually fairly comfortable in the hand and the build quality seems really sturdy. (I wasn't a big fan of the brushed metal look, but that's consistent with their other cameras)
The camera seems to respond really well and I enjoyed playing around with it. That being said, I found the controls to be less than intuitive and I had to ask for help from the Samsung rep...... except he didn't know how to change the manual settings either
All in all I think it's definitely going to be an interesting camera once it's released.
Oh and that screen is GORGEOUS!