i have vans cirro size 9 and use l/xl for '09 rome targas. they fit fine. they are my main bindings right now.
I had actually bought a pair of l/xl union data's last year. When i strapped in at home they were ratcheted all they way and looked ok, but i ended up returning them cuz it felt like they would need some more tightening once i hit the mtn. it was a gut feeling, but i can't say for sure.
i need another pair of bindings for my second board so i'm looking at forces and 390 boss for this year. i guess i will have to try the union sizing again, but i'm thinking of buying m/l first since i've seen the l/xl once already.