They're great, so long as you're using them as a backup shoe only. Otherwise I'm sure they'll wear out in a short period of time. (Not to mention the thin soles make it so you feel every crack, crevice and bit of uneven asphalt.)
To be honest- if you have a pair of Target Mossimo Supply Co. flats you've broken in and are willing to fold up in your purse, I think they'd be a little bit better as the sole is thicker. But considering the Target brand flats don't fold up as compact as these (and I have to break them in as they will initially give me blisters) it's a lot easier just to buy and keep these when the occasion arises.