Product review (2 stars): You get what you pay for. Not that that is a bad thing....
The zippers are unreliable. For the price, I'd recommend folks buy as many pairs as they can so they have plenty of backups. I only bought two pairs but the zipper on the right leg of the first pair gave out on the 3rd time wearing them. Note, I only wear them for a few hours at a time.  I suppose one could argue that I should buy a bigger size. OK.. but they ARE *compression* stockings, they're supposed to be tight.... so I would expect the zippers to hold out.  Nonetheless, maybe someone with more dainty calves will have better luck. Other than that, I was really pleased with the few hours that I was able to wear them. I still have 1 pair and a spare left leg so I'll keep trying.