My mom has an extra deep mattress and she has struggled to find sheets that will not only fit, but STAY IN PLACE!  She's also had a TBI (traumatic brain injury), and constantly wrestling with her heavy mattress is no longer a viable option.  After reading reviews for this set (especially all of the raving about the thick elastic), I hoped that these would work for her.
PROS:  The sheets easily fit her extra deep mattress.  The thick elastic around the fitted sheet secures it so that it doesn't 'pop' off.  The colors/flower designs are very pretty - she enjoys the look of the set.  She tells me that the sheets are soft and comfortable.
CONS:  I didn't realize that the sheets had a sateen-type finish, and mom said they felt a bit slippery at first...but now that she's adjusted, she's 100% happy with them.  I'm glad I found this set and would definitely recommend them to anyone looking for deep-pocketed, pretty sheets.