Smooth, cool, simple, go with everything pillow cases.  Because I have King Bed, all the sets come with King pillow cases.  I always was searching around for single cases.  These fit my requirements without being the "New" bamboo paper cloth, rough and hot material out there today.    

Pros: 1st of course, Great Value, plain & simple design you just want to lay your head on. Cool to touch and smooth feel.
Cons: Non yet.  Not expecting any.