I think it's the reflective pieces...Is that glass or some metal? I'm not sure what the material is, but I tried on that shoe when it came out. They ran extremely large, oddly (the pair that fit was 2 half sizes smaller), and they had pieces of the reflectors that dug into my feet. I'm surprised if anyone got those shoes to work, because they weren't constructed properly.
I would say Very Galaxy, even though I never purchased it. I'm not sure what I'd say would be my worst shoe, because I never bought one. I've occasionally had problems in trying on the Decollete, the Simple, and the Very Prive. I had to try on a brown VP recently and it hurt, unlike a different colored leather one I had years ago.