As much as I hate to admit it (snobbery alert!), if I close my eyes on a full Tange 2 machine or a full 531C machine, there is little difference. Granted, most Tange 2 frames have that sterile Japanese feel to the frame, and most 531C frames don't - but I'd put that down to build and geometry before I would blame it on the tubing.

<snob> That said, I prefer 531 decals. </snob>

-Kurt