It's magnetic!  And it exacerbates the primary rule of lint:  if your backdrop is black, the lint will be any color other than black; if it's another color, the lint will be black  

.  The only huge problem for me is that velour shows wrinkles in a much more intrusive way than muslin.  I'm OK with wrinkles in my backdrop but they have to be "quality" wrinkles  

.  They are much less "reflective" though.  I've used both and I only have muslin in my kit now.
Jim