A:AnswerYes. We have had problems with the sensor when we exercise because the watch malfunctions if you sweat. We have already returned one and are going to return another. Dissatisfied with this product.
A:AnswerThe Fitbit+ subscription is optional. The watch comes with six months free. After that it is just 9.95/month. I personally think it's worth it but one could easily survive without the subscription or start and stop it as needed.