I purchased the Sense based on a 50% discount offer after Charge 4 failed for the second time in one year. First Fitbit I can actually read outside in daylight! Most functions work very well although technology upgrades change readings slightly: heart rate and distance have lower numbers than C4 and treadmill. Overall very pleased with performance. Battery drops about 14-15% daily so probably 4-5 days with normal usage. Sync. has to be activated frequently on Asus cellphone, an ongoing FB issue with non-Apple, Samsung phones apparently. Good health stats but explanations require pricey Premium subscription. Well worth the discounted price but not the full regular price.
