I recommend sticking with the Fitbit brand for these
346004
I recommend sticking with the Fitbit brand for these.  I ordered a 3 pack of the off brand and it broke a LOT quicker than this one.
1300556
My husband purchased these bands for a replacement on my Fitbit Flex.  I received them on my Birthday and put the blue one on.  Within five days, the band broke.  I am now using the gray one and hope it will last longer.
2882649
I have been wearing another brand for about 10 years (started wearing silicone adhesive bras in high school) and Target stopped selling my favorite brand.  These were thinner and stiffer than others I have had and the adhesive barely lasted 1 wear.  I usually get about 20-40 wears from other brands.  At least they weren't expensive.  Oh well back to the drawing board.
2833962
Don't waste your money on the aftermarket ones. Buy the name brand one. This one will not stay fastened and has caused us on multiple occasions to go on a hunt to find the lost Fitbit!
395057
I was so excited to receive these, but they aren't made to the right dimensions and don't remain closed, so I've now lost my Fitbit. I know, I know, my fault for buying an off brand product, but wow was it majorly disappointing. Goodbye, Fitbit, you're very much missed. :( 0/10 would not make this mistake again.
848675
I purchased these for my son and one of them broke within a week. They are less flexible than the FitBit brand, so take much less time to crack along the 'sleeve' where the sensor is inserted. I didn't pay much for these, so I'm not hacked off, but wish they'd lasted a bit longer
2414821
These are okay.  They seem thicker and heavier than the original FitBit bands, and they are also less flexible.  But I'mm bet this means they are more durable, too.  And yet they are of better quality than other non-brand bands for FitBits -- other brands got dirty so easily, tore, and made it difficult to get the FitBit in and out.  So while this is not as good as the bands made by FitBit, it is better than the other non-brand bands I have tried.

Also note -- the size was not described on Amazon.  These are the equivalent to FitBit's "large" band.  My adult wrists are pretty thin (I am 5 foot tall and 120 pounds), and I have to wear these almost on the tightest hole.  So I do not think these will work on a child's wrist or even on an adult with very thin wrists.
1558916
They fit like the Fitbit one, look good, and my wife prefers the look to the standard black. Not much more to say.
Update; after one month of ownership the seals have let loose and they are not usable. I am not sure if Fitbit brand uses different glue or material but they are very hard to fix. My fault but I managed to superglue the Fitbit in while the band still does not stay together. Do not buy.
3719856
They say the definition of insanity is doing the same thing over and over again and expecting different results.  Well, I have had a Fitbit One since December of 2013.  Within the first year, the original clip failed and I got Fitbit to replace it for me.  I have checked my Amazon order history and I have had to buy AT LEAST four more clips in under two years.  The most recent one failed within days (that little hard plastic part at the end of the clip came loose and the silicone covering the metal started bunching up and cracking).  So there, SIX original Fitbit clips in three years and I already needed another one.  I decided to go with a different maker.  It certainly couldn't be any worse.

I'm pretty happy with these.  You get the six you see in the photo, but there was a bonus one included in my package (looks like everyone gets this) so you are really getting seven for just a little over two bucks each.  So right there are more than I have already gone through in almost three years.  There are also two little black silicone bands included to help you secure your Fitbit into the holder, although I have found I don't need these.

I don't even care about the colors since I always wear mine hidden.  But if you like to color coordinate, you get a black one and a burgundy one that are like the original Fitbit holders and then some other vibrant colors.  (My "bonus" one was a light blue that was similar to, but not quite the same as, the aqua one in the photo.  I gather the bonus ones can be different colors.)

I have worn mine for about a week now (I just keep the Fitbit in the same holder until the holder fails, removing for charging once a week) during all kinds of conditions.  On the neck of a t-shirt, on my bra, on the waistband of my pants, in an armband I bought for sleep, sitting around, walking, and during super vigorous cardio workouts.  The Fitbit stays in there just fine.  It is maybe a little difficult to get it in the first time, but nothing I can't handle, plus that just means the fit is secure.

The clip of my first one has not separated so the little plastic part is still securely up against the silicone.  This goes over a piece of fabric like a t-shirt neck or a pants waistband easily, but it stays in place once you put it on.

Anyway, right now I am way happier with these than with the original Fitbit clip and I would definitely recommend them to people as frustrated with the original Fitbit clips as I was.
828561
While technically they work just as well as the Fitbit brand, they are much stiffer and I could never get the provided clasp to work. It does work pretty well with the Fitbit clasp though.
597560
They don't seem to hold the fitbit as  snuggly in place. It has fallen out of the holder 3 times now and am afraid I am going to lose my fitbit.
3834533
These are alright. The Fitbit flex fits in them, but it is hard to get the Fitbit flex out of them.
2373641
The band is painful to wear at times... the under gallery of the opening is rough and irritates my wrist. On top of that, it continually comes apart and falls off on it's own... Wish I just spent a little more and got the FitBit branded one.
4226979
These were very hard to plug in and unplug from my Fitbit. So much so that I was concerned they would ruin my Fitbit. The plastic around the charging port on my last Fitbit eventually broke off so the charger could no longer stay attached. I was afraid if I kept using these it would make the same thing happen to my new Fitbit, just that much quicker. I ended up buying an actual Fitbit brand charger for a little bit more money and it works much better!
1422761
Works with the Fitbit Flex but is not as nice as Fitbit brand.  The screen windows don't match the band color.  If you don't care about appearance, then buy these and save money.
2132873
These look good, but the are a little smaller than the one that came with the fitbit. I ordered large and they are somewhere between the large and small bands that come with the fitbit. If the large is tight on you, these will not fit you.
1142772
Compared Fitbit Charge 2 to this one and the Fitbit had a much higher step count on a given day.  Much more realistic to my activity level than this watch.