I've got a pair that I bought from the Trafford Centre. I honestly cannot say that I have noticed anything in the way of 'shaping up' my legs but they are very comfortable, which is important to me as I'm on my feet much of the day. On the down side, they take a bit of getting used to and they do look a bit like 'special shoes' with the whopping platform sole but on the whole, I'm happy with mine. I do think it's worth paying the QVC postage on this occasion as it may take you a couple of weeks to get used to the slightly different way you walk when wearing. I'm sure you'll be happy with them but at least you've got the 30 day MBG in case you can't get used to them.