The main advantage of this device is the automatic transmission of data to your computer and / or your smartphone. The balance seems a proper accuracy because the figures given at the same time correspond to a few hundred grams to nearly balance those of another of the same type (piezo), unable to say which is the most accurate and / or the most faithful. For cons, the impedance meter function gives results fancier, the indicated fat ranging from one day to the other more or less one to four kilograms while the total weight varies more than plus or minus a few hundred grams . Note that the measurement conditions recommended by the manufacturer are strictly adhered to, but the measurement of body fat is very difficult to perform and depends particularly on the moisture of the feet and body at the time of measurement. In conclusion, an acceptable balance, especially interesting for the automatic transmission of data, but rather to an impedance meter questionable data. Additional Comment 09/03/2015: Following a wireless configuration change my computer system not only balance data is only recorded over, but after balance reconnaissance attempts by the new equipment, she worked at all, even in "stand alone". While I thought my scales definitely out of order, I contacted the Withings service which in well-documented mails communicated to me the detailed procedure to restore both the operation of the balance and recording Automatic data. Everything works properly again and bravo and thank you for service Withings.