Got mine ordered (Zip) and seemed like it arrived really fast. When I opened it it was so tiny I felt like Will Smith being handed the noisy cricket in MIB1.. I just clipped it onto my keys and keep it in my pocket. Seems legit, although I am a little concerned about fake steps counted, unless it has a kind of lag for recording them because I pulled it out once after stopping and it was still counting up =P
Although as some said there are other step trackers available out there, the app itself has integration with the Target program so you don't need to manually record your steps as the process seems automated -- also possibly to prevent cheating from people rounding up their counts or adding guesses.
Also note that when choosing your store number in the app, the store numbers are listed weirdly: store T-0020 would be listed in close proximity to store T-2001 because it seems to ignore leading zeros or general numerical order and list them according to the first non-zero numeral.