We've has these sheets for almost a month now and after using everyday and several washings they have held up just fine.  The feel of the sheets is smooth and they don't wrinkle--they wash and dry (on delicate setting) beautifully.  I was a little dubious about the single strand of elastic running loose around the edge of the fitted sheet as some reviewers noted, but it is holding up just fine so far.  I'm off now to order another set for the guest room.