Update:
I used the links I gave for the free samples and chose there 'middle' option for how fast I needed them, 'soon', I think it was. Well, It just came in the mail about 30 minutes ago. Very fast service

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Package Contents:
I requested 2 samples each of Enkamat and EnkamatPlus - received
1x Thank you letter and brief product descriptions.
3x Various Literatures (based on selection check marks, i'm sure)
1x Business card from manager of sales & marketing of Industrial products.
Enkamat sample is 3x5
EnkamatPlus sample is 8.5x11
woot!
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I don't have a camera so I'll try to describe the differences. Plus is twice as thick and much firmer. Also the weaving isn't quite as random as with Enkamat. The squares that the weave form are roughly .5x.5". Lastly, the plus is backed with a fabric but can come off easily if you so chose.
That's all for now.
edit:
best i can do with camera phone :/