I hate to be the one who goes against the grain...and I just got my first Zues bindings only a week ago. So you can take this for what it is worth.
I wear a size 11 and have always ridden Hyperlite, Parks XL, bindings. I think I have had a pair from every year they were made, starting with 02. At the boat show last weekend I tried on a pair of 06 Zues bindings. I was amazed at how "locked down" I felt. The mechanical action of the hinge forcing your foot into the overlay is a lot more supportive than the option 2 of the parks. Anyways...back to the sizing. I personally thought the Larges were the right fit for me. If you hold a pair of Hyperlite XLs up next to a pair of Zues Larges, you will see that the foot bed is the same size. I thought there was a big difference in size between the Zues Larges and XLs. I wouldn't want to go to the XLs and loose that crazy "locked down" feel I got from the larges. Besides, it was that crazy locked down feel that made me buy them. Just my $0.02
By the way, thank you to J-Rod, Evan, Kevin and everyone else at the CWB booth last weekend for helping me out. I felt kind of "dirty" buying CWB (I've always only owned Hyperlite) but am glad I did!