Buyer beware!  Band is made of defective material that is prone to tear.
355501
I purchased a Microsoft Band back in June, 2015.  Less than 3 months later the watch stopped working due to some software issues.  Microsoft agreed to fix the watch because the problem fell within its 3 month policy so I sent the watch back to them.  Rather than fix my watch, they sent me a used watch as a replacement.  The replacement watch was a much older watch.  Parts of the watch was worn down from use.  For example, there is a metal plate that holds the sensor in place at the bottom of the watch.  The coating covering the metal plate had peeled off exposing the copper material beneath it.

The replacement watch lasted another 3 months until the band broke.  I was sitting down in my car when the rubber material that connects to the metal clasp tour apart and the watch fell onto my lap.  I was shocked because I did not realize how poorly the watch was made.  I sent the watch back to Microsoft for repair.  However, instead of fixing the watch they returned it to me with a letter stating that they found excessive damage to the watch that was unrelated to defect in materials.  I work at a desk and had not used the watch in any strenuous physical activity so how is that possible.  I was tricked by Microsoft's sleight of hand.  I was slipped a much older watch that was probably already compromised in place of a fairly new product (only 3 months old) that had defective software. This was hardly a fair, equitable exchange. The same watch should have been returned to me after it was fixed or a new watch should have been provided in its place.  In any case, the rubber material holding the watch together is not sturdy and is probably made of a defective material.  Unfortunately, unlike most other watches, there are no replacement straps for the Microsoft Band.

Furthermore, the watch was marketed as a product that could endure the strains from physical activities, yet it could not survive the everyday use from someone who works at a desk.  The product just does not live up to its advertisement and is comprise of a rubber material that seems to tear easily.  This is not what you would expect from a product that is priced at this level.  Also, Microsoft does not stand by its products and will leave you high and dry.  I highly urge you to read the other complaints before deciding to buy this watch.  Hopefully, you won't make the same mistake as me.
3989277
It's a nice band, fits right ... however, after using the band for maybe at the most a dozen times, the little knob, that is on the band, that you push down on to remove and put on the band broke off.  So now I have to figure out how to remove the band without damaging the FitBit watch frame.  Very disappointed.

Umtele contacted me right away and sent me a promo code to replace the band so I'm changing my rating to a 5.  Not only is the band everything you could expect as far as quality but also excellent customer service!  You can't beat that!
3756597
The Microsoft Band 2 has excellent features like: continues heart rate monitor, built-in alarm/timer/stop watch, fitness guide, etc.

But there are a few quarks.  I'm disappointed to say that this fitness band has a "sweat corrosion vulnerability" meaning the materials starts to tear after repeated use. Mine started to tear today after I went out for a run.
3752961
GREAT band, but completely not functional. I've had this band for a year now and am on my fourth one. The band tends to rip after about 3 months of use. I'm not particularly rough with my band, but I do use it when I run and lift - nothing it shouldn't be able to do. Compared to it's competitors, this band has it ALL. It supercedes every band out there in terms of a 'smart' band as well as a fitness tracker, but unfortunately, Microsoft didn't put enough thought into the actual band itself.
154655
This would be a 5 star review, up until last week. I purchased this on Black Friday and have worn it daily except for charging every 4-5 days and removing it to shower or swim. I absolutely love the look of the band and the app as well. However, I noticed when I removed it to charge it this week that the band on one side has completely ripped and is barely hanging on by a small piece of rubber. The band is now totally unusable, and since it is all one connected piece I have to discard the entire thing rather than just being able to replace the black rubber band. This is a shame; it's my second Jawbone in less than a year that I've had to discard due to poor craftsmanship. My first Jawbone was the UP2 and the small button on the end to switch modes broke off and was lost. Jawbone's customer service can hardly be called customer service; you're better off not wasting your time with them since they will not reimburse you for anything and take no ownership for their poor product quality.

Although I hate to lose the sleek look of the Jawbone, I've had enough with the poor quality. I'm switching to a Fitbit.
1396778
I am giving the band one star because the one I got is defected. the bottom of attachment to watch is perfect but the top is the defective as you can hopefully tell from the images. the last image shows how its to big watches band attachment.

I am especially disappointed because I paid extra for same day delivery, so I am basically out the $6.  I do think it is a nice band and I will be exchanging it , I will probably pick up another but like I said I more upset at the fact that I spent an extra $6 to get it here and I won't do that again because I don't want to be out another.
1490495
I've been wearing this band for five months now and I've repaired holes four separate times. The band itself is nice but the mesh covering over the FitBit (holds it in place, but still lets you see the display) easily stretches and then comes detached from its frame -- my FitBit just fell out of it one day (thankfully I was at home). The issues arose simply from everyday use -- I only removed my device once a week for charging (meaning I wasn't stretching it out myself by fooling with it). The other rips I've managed to catch before they got too big. If a product is being marketed for holding a FitBit, you make the assumption that it will be secure. Unfortunately, that's not the case with this product.
2385346
it looks great, but i can tell the band is going to break in a matter of weeks.
2516011
While the watch is attractive, the band is of poor quality and came apart after 3 months of use. The return period expired after 6 weeks of purchase. It would be nice if amazon would contact the seller regarding the quality of this product.
4887496
The band of the watch ended up breaking off after just about 1.5 years of casual wear. Interestingly, it is not held by pins, but a plastic molded piece that fits into the rubber band. Not sure why the company couldn't use metal pins rather than some cheap plastic. The I ordered (as a gift for someone else) loses about 5min per month, requiring a re-set.

UPDATE: The watch band is a piece of junk, so is the customer service of the company. The band broke 14 months after purchase, I called the repair department at Bulova and they said it was only covered for one year. I sent the watch in for repair and $80 for the band repair. Today, 7 months after I had the band repaired the first time, the band broke once again (from casual wear-and-tear). I called the service department and they said they only have a 6 month warranty on repairs. I asked if they would cover the repair since it was only one month overdue and I paid full price the first time and they said no. This is now a pocket watch, but I will NOT be purchasing another watch from Bulova again The material of the watch itself is good but I believe a 5 year old's Hello Kitty Watch band is of higher quality than this one...

DO NOT BUY
620685
Disaster! I had it only a couple of weeks and the cheap band broke clean though. All I did was wear it. No extreme sports or activities. The green thread came unraveled and the leather (?) formed a tear right across the middle.
1705857
The clasp on the band is still defective---even with the "free" band they sent me to keep it from unclasping.  My husband bought me the Vivofit as a gift and I loved it until I noticed this afternoon it was gone from my wrist.  The clasp has come undone several times in the past - even with the band - but I've tried to keep an eye on it so that this didn't happen, but *poof* today it fell off somewhere and I can't find it.  I retraced my steps all over town and I'm just sick about it.  I love the Vivofit, but losing $130 due to a defective clasp just disgusts me.  If you buy this, make sure you superglue or duct tape it to your wrist or you'll lose it!!!!!
2958127
The band itself is beautiful and well made for its price, its the tool that was a major failure. I took 1 prong out before the damn thing bent itself out of shape... garbage quality. Had to go to a watch repair store to finish the job....
3622266
The band is not the high grade rubber.  Kind of cheap.
3380849
I originally gave this band a 5 because I loved it but today it tore and I can no longer wear it. Ive only had it for about a month. So sad!)
1522719
This was a good price, but after three wears (literally three) the band separated from the backing, which was also cracking apart.  Not worth sending back, as I already discarded the packaging.  Recommend you avoid altogether.  I own 12 watches, all of which I wear, and have never seen this poor level of quality in a band whether bought in a store or online.
2162577
Great concept, looks great, works pretty flawlessly for pre-android wear 2.0. However, if the band tears/breaks, you're done. Mine had a slight tear in one slot of the band when i received it so I was forced to return it, because they cannot be replaced by the consumer. Huge flaw, band doesn't seem super strong/durable long term.