I have a pair of shape ups I wear to work everyday for the last 3 years - they are still in good condition, but can't really keep them polished up too well. The new ones I bought feel so much better,super comfortable. I had bought the first pair when they originally  came out - the first impression of the new pair is MUCH more comfortable than the older pair,could just be the compression is starting to get lost after all the walking on the older pair. I will wear these couple of weeks & buy a second pair , just so I can rotate them from day to day - so 6 years two pairs ??.I do ALOT of walking for work, mostly cement floors & these shoes have been very good on my sore old knees. They are not for everybody ,take some getting use to,not the traditional walking shoe.