Different versions of the Expodisc

[DarkDTSHD]

I just noticed that the white surface on mine is smooth. Whereas the version on the website now has a checkered pattern. More a cross-weave pattern. And it now has a string and a blue band attached. So you can have it around your neck or the lens. But both have "patent pending" printed on the side. Mine was made in 2005. And $40.00 cheaper.

Is there any real difference functionally? Or are they simply just using a different kind of white material?