Cool thanks. Good review. I was actually thinking about buying these also. But sierrasnowboard told me the highback was the one from the Force SL. And the Union website says that the Force SL's are for freeriding. So I'm still kind of torn between the Contact and Contact SL.
They also told me the other difference is that the toe cap is from the 2011 Union bindings. But that's no big deal for me.
I'll probably make my decision on Saturday, since it's 40% off if you buy it in-store.