Customer Ratings & Reviews

I purchased three fit bit flexes. One lasted 4 months and would no longer accept a charge. The second did not make it out of the store before failing and the replacement that Best Buy provided lasted less than one month before it failed to hold a charge for one day. A very bad product that I would rate below poor.

I was really impressed with the Fitbit. This is my third one. I started with the Ultra, then went to the One, now the Flex. I upgraded each time because they kept getting better. However, this last iteration is a big disappointment after the long wait. I pre-ordered the Flex in March and received it in May; only to have it quit on me after a week. I had the others for a year each and they still work. Besides, the Ultra and the One track floors; the Flex doesn't.

I have had my Fitbit Flex for less than a month before it quit. I didn't do anything unusual, not exposed to anything unusual. Fitbit was going to replace it... until I produced my receipt. "oh sorry, not an authorized dealer". The warranty and 45 day satisfaction guaranteed policy do not mention place of purchase, but that was their reason for not exchanging my Flex. So, Beware! It may work, but you may not get the warranty you think you are getting.

Do not buy this. It is terrible. If you sit in a recliner that rocks it adds steps. And also if you push a grocery cart while shopping the vibrations will put it into sleep mode. I returned the jawbone up for the fit bit. Jawbone is definitely a better device.

This is a hyped up pedometer that measures step based on hand movement. The sleep tracker is pretty useless

I had my flex for 5 days and it fell off while I was out one day. Didn't feel it fall off- no idea where I lost it. It had come slightly loose earlier that day 2x but I caught it! Same thing happened to my son- lost his after 4 days! Do NOT buy this product. The band needs to be changed so that it's more secure- SO disappointing!!!!!

Fitbit customer service isn't easy to us. Service is via email only, no live chat or phone options. This fitbit lasted all of 18 hours. The dongle for the computer sometimes worked, many times didn't. The actual device wouldn't transmit information after 18 hours. Not sure I will try another one.

Upgraded from Fitbit One to Flex. At day 15 the battery failed to charge and no one had a replacement in stock. Doesn't display steps or track stairs. Just not a good upgrade from the One, if you like the One's feature set.

I wore this device for nearly two weeks along with a FitBit One for comparison, it was inaccurate counting steps for known distances... it's sad, I really liked wearing the Flex. In the end, I returned it.

Faulty design. Band is glued in middle. First flex broke in two after month. Replacement only lasted a week before doing same. No longer using. Waste of money.

I have had this for 2 months, never got it wet and keep it very clean and one day it just went dead and will not charge. Sent fitbit an email, still waiting to hear from them . RIDICULOUS!

I do 3 1/2 miles on an elliptical daily and none of those movements are recorded on my fitbit. Really doesn't do what it claims to do. Would totally like my money back.

I bought a Jawbone Up and then a Flex I kept the flex for a day the interface and the inaccurate step counting was horrible. I returned it and would not recommend this to anyone spend the extra 20 dollars and get the Jawbone Up

After a little more than a month having the fitbit flex it stopped responding. I tried reseting it, no luck. I reinstalled the fitbit software, no luck and its ben more than a month so Best Buy won't take it back.

Inaccurate, never agrees with my old "One" doesn't do stairs. Waste of money - I am going back to the One - only replaced it with Flex because I thought I lost it.