I do. I've had it for 2 years and am obsessed by it. Pros - more than a pedometer, it also tracks sleep, exercise, heart rate (depending on which model you get) and you can use with other people who own one for motivation, challenges, etc. Cons - pricey.
Best thing I've bought for years, it keeps me way more active than I ever was before and it gives an all round picture of your health. You can also log your daily food on it.