I was skeptical after reading some of the reviews about the quality.  Split King sheets are so hard to find, and at this price I thought, "What the heck!"  They are very much worth the price.  I would prefer 100% cotton as this microfiber stuff doesn't breath as good; however, I knew I was buying microfiber.  They are soft, don't wrinkle, and seem very durable.  We have had our for a few months now and they have been through the washer and dryer numerous times and have held up very well, and the colors haven't faded.  

Pros: Economical, quality, softness
Cons: Fabric doesn't breath