I was also lusting after the Double Cross and the Cross Check. The geometry in my size (52) is the same. The CC has a slightly shorter effective tt length (4 mm) and slightly shorter wheelbase (1 cm). I can't tell the difference.
My LBS told me that Surly based their road bikes on samples of Soma bikes. (the CC and the Pacer). They didn't try to sway me in either direction, they felt both were equally good.
Frame prices were the same at the time, but buying a Surly complete brought my total to much less than buying a Soma and building it up. I really couldn't have afforded either when I started looking... way back when Surly CC was also only available as a frame.
I do loooooove the Soma logo.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson