Having owned a FitBit One I knew that I needed something I could wear on my wrist to give me a more accurate reading of steps taken, miles walked and calories burned. The FitBit One is a clip on style activity reader, the FitBit Flex is worn on the wrist and allows for a much easier to read display. Since I am a bilateral amputee my gait (width and length of my steps) varies; I couldn't get an accurate reading with the FitBit One so I started asking my friends about the Flex version. I am so glad that I decided to give it a try because it is a lot more accurate than the clip on version (FitBit One). This doesn't make my wrist sweat when I am on the treadmill, walking outside or doing a Step / platform workout. The screen is small but it is easy to read; there's no glare to it but if you wear glasses or contacts the numbers can be hard to see if you are trying to read the screen when you are in the middle of a workout. If I had to grade this on a scale from one to ten it would be a solid eight; there is room for improvement but it isn't something that is going to fall apart or break even if you are a total gym rat.