I was hesitant to buy tights online due to potential size issues, etc. but couldn't find Spanx anywhere around me so took a chance.  I'm glad I did!  These are amazing.  I only wore them once and washed them once (came out of the wash perfect), but I expect they will last a long time.  Granted, it's a bit weird when people hug you and your pantyline is near your upper back, but I lived through the minor embarrassment.  These shaped really, really well, and I wore them to a wedding that was a few hours away--so car trip there, wedding, reception, plus car trip home.  Still comfortable, and no big lines when I took them off. Thank you, Spanx!