Was bought a Microsoft Fit band 1 for Christmas and its great. Cannot fault it.
It keeps accurate data about my sleep and my fitness and heart rate. The Sleep part has bern extra important to me as i have always been curious being on a lot of medication on how many times if any I wake up and how long it takes for my meds to knock me to sleep.
Anyway I would Highly recommend this product. When the Microsoft Fit band 2 comes down in price il purchase that as its more rounded for your wrist as apposed to the square on the 1st.