less frequent fast charging after a year of use
590626
I really like this cable I've had it longer than a year but recently whenever I use it I have to unplug it and plug it back into my phone a few times so it can fast charge otherwise i get regular charging or slow charging
3737701
I've had this charger for a little over half a year now. The first time I plugged it into the wall, it wouldn't charge for a while and eventually started charging after a couple of hours. Now, there are times where I can leave it plugged into the wall and nothing happens for a day or two and it'll randomly start charging (you can tell by the number in the middle blinking).
3319059
I am writing a review in June 2015 because the charges died about 3 months ago. Yes I used it often. Yes its fast, but I would expect a pretty simple electronic like this with no moving parts to last longer that a couple of years. Repurchasing again, hoping it will last longer than the first one I got.

Updated on 6-24-15. After I used it I find that this charger is not as fast as the original charger I got. It works pretty much as a regular charger and takes as long. Also I thought that it came with USB cord, but it doesn't. Good thing I saved the one from the damaged first charger.
3941343
Item worked well until 6 months now doesn't charge fully and takes forever, not so happy
2351317
Charges my phone, but I didn't notice any faster charging with my Moto X first generation.

--- Update ~ 1 Year Later ---

Charger seems to be dying, I only get intermittent charge with my Moto G4. I'll be looking to buy a replacement that isn't this.
1616503
Works well, has a good battery life for now. It was fairly slow charging via sunlight though, but it still charged. Has a 2.1A slot which is nice for faster charging.

Update: At about 1 year exactly, it stopped charging via USB cable and even via sunlight it didn't appear to be charging. It was good while it worked.
3942599
I bought this battery 18 months ago.  For the last 6 months I have had to keep my ASUS UX50V laptop, which I LOVE, plugged in non-stop.  I had forgotten about the one year warranty, which is on me; but I truly believe a battery, used normally, should last longer than one year.  Now, after only 18 months the battery is bloated from having to stay plugged in all the time.  I know it shouldn't be plugged in all the time, but without being plugged in, about 6 or 7 months ago, I would get maybe 10 minutes of power while unplugged.  I toyed with my power saver modes, changed from quality to power saving mode, and all I do is compute for school.  I don't watch movies, I don't game, and I don't socially network on my laptop.  This as an extreme disappointment as a purchase.  I would look elsewhere; in fact, I am looking elsewhere for my next battery replacement, which I now need due to this one being such a disappointment.
1116428
lasted for about 4 months.  Now it no longer fast  charges.
3748549
Stop charging after 10 weeks of use, don't even daily use
4342449
I bought this about a year ago. Recently it makes a problem with my Macbook. My Mac recognizes this takes too much current from the USB port.
4601917
Extremely slow charging rate. Ok but would not recommend.
3797036
Received as a Christmas gift a year ago. It worked fantastic for that while, but as of the past couple months, keeping my phone connected to fast charging no longer keeps my phone charged. I use it to keep it charged as I play Pokemon Go, and it used to make sure my phone stayed charged. Now, the battery in my phones battery slowly depletes when connected. The device also has been making hissing noises, and I am unsure if I should still be using it.
2680625
After about nine months, it stopped charging and it would not stay plugged into the phone fully. They did a replacement under warranty within three days, and the new one actually has a slightly different connector. It fits a little tighter than the other one ever did, it's slightly wider, and you can tell that the metal pins on the inside are a slightly different shape. I don't know if they just fixed it for the new version, and made it more durable, or if it's just a manufacturing Corp. But the replacement has worked perfectly. These cables have extremely low resistance, and charge your phone very quickly. Most six foot cables don't. Also, low quality cables, like the ones from your gas station, tend to charge slower, and waste some of the energy going through the cable. These have extremely low resistance, which means that it will charge faster, and if you are charging from a battery, you will get more use for your battery before it dies.
32016
Good charger, a little slower than I'm used to but Good design.
3159589
These chargers seem to die every few months, buy third party
2575907
I would have given this charger a 5 star if I were to write this review a few months ago. However, its been almost 4 months since I bought this (so not that long) and it has gotten very slow in charging my phone. I read many good reviews on Anker products so I was expecting this charger to last up to a year at least. To my disappointment, this charger stops working after I plug it in. If I move my phone the charger stops working. Even when it does work, it is very slow. I have also noticed that my phone dies faster after using this charger. Although this charger was very cheap, I suggest investing in the apple charger.

Update: Anker has reached out to me and within a week or so replaced my bad charger for free! They were super considerate and helpful. The new charger is very fast in charging my phone.
2162088
After one year I am finding the battery taking longer to charge - 2-3 hours - and not holding the charge as long - 1 1/2 days - and I don't talk on it much.