This is my offering for the 753 bike show. While not a first year it the first model Waterford made after the Schwinn bankruptcy. It was originally a Team Mak red, white and blue with Campy 8 sp. I sold off the groupset and had it repainted in yellow. Even though I don't race I can feel the difference between 753 and 531. It's got a Daytona 10 sp group with Zonda wheels.
753 is a very thin tubeset, so accordingly it builds up into a more flexible frame than a similar 531 frame that has thicker tubes. Of course, differences in the build configuration can make a difference though - Waterford for example built some OS sized 753 frames which most likely would feel more ridged than a STD sized tubed 531 frame. The details do matter but it's a matter of physics that 753 is flexy, not stiff.