Fast charger, but not the fastest.
340617
I got this charger thinking it might live up to its product description and be the "fastest charger on the market", and while it is fast, I don't think it is faster than the other chargers that ravpower sells.  first of all, the charging cord itself is very important. I used a cheap USB cable and the charge rate was very slow. that when I used the flat USB cable that was provided with the charger the charge rate was very fast.  Next I compared two Rav power chargers side by side, using the same cable and same cell phone, a Samsung Note 2. This charger has two USB output ports. one is labeled "quick charge", and the other is labeled 2.4A. for the first test I used the quick charge port and noted that the charge time to increase the battery level from 30% - 100% was 100 minutes. Very respectable.  Next I tried the 2.4A port, and the charge time was about the same.  For the final test, I used my older ravpower charger model RP - PB 19, which has 2.4A and 2.1A charge ports.  using the 2.1 port my phone again was charged from 30% to 100% in 90 to 100 minutes.  perhaps this is because my phone doesn't draw that much current while charging and if I were to charge a tablet, the charge times might be quicker with the new charger. but I am just guessing because I haven't done that test. So it would appear that even though the charger does charge my phone, or presumably any other phone, super fast, it does not appear to be any faster than the other ravpower charger I have.  If the product title did not have the words "fastest charger on the market", I would have given this 5 stars, because it is a very fast charger and can charge any cell phone multiple times before it needs to be recharged itself. but since it didn't quite live up to the hype, I deducted one star. Overall though it is a great charger.
2051831
Works great, but takes longer to charge, I guess because not a direct current and with all my items charging at once, it will slow down the charging times on my devices.
866378
It's overall a nice charger but it's not 2.4 on every port.
911533
Works reliably, but fast charge doesn't seem to work all the time. I have a dash cam on one port and the phone on the other, and although the phone doesn't lose charge sometimes it can't fast charge.
1089767
The charger is good but I couldn't fins too much difference in the speed it fully charges the tablet. But its a very good option to avoid using the USB input to charge everyday your tablet.
749499
Charges super fast but the end adapter that plus into the phone is kinda weak and gents easy. Hoping this doesn't cause a problem later with charging ability.
3251791
This charger does a good job of quick charging my phone. Nothing else to say other than the build of is a tad clunky making it difficult to put on a plug behind a bed or tight spaces.
4822141
It is not fast charging.  This is a standard charger.
4369156
Not as fast as a speed charger, but certainly does the job.  Great to not have bulky adapters hogging up the outlets anymore.
3541377
I bought this for my son who wanted the adaptive fast charger.  This charger works well,  but doesn't fast charge his phone. Anker did reach out to me which was greatly appreciated and offered to help out.  It wasn't a faulty charger,  rather I assumed this was the adaptive fast charger,  and it was not.  The charger works great though and the cord is much better than the standard flimsy ones that tend to break.
1246023
Charges very slow and is a little bulky, but it is a durable charger.
1980581
Charger obviously works, but it's definitely not a fast charger.  I was a little upset that it was advertised as a fast charger.  My fast charger that came with my phone broke, and I was looking for the fast charger as it only takes an hour to completely charge your phone.  This shows up as cable charging which takes about 5 hours.  False advertisement, but works.
918247
The positive is that it works as described.  The unit had all the cables and managed to charge my galaxy note, nook and even my e-cig passthrough without troubles.  It charges from USB pretty fast.

The things I found frustrating are :
1. when it detects any strong light, including indoor lighting, it starts attempting to charge. Even when i would rather it not.
2. when its in decharge mode, it doesnt seem to charge at the same time (even though it showed it was). I had it in real strong sunlight charging my phone and it decharged as quick as when its at night.
3. if it gets real hot (like in the car window), it will show itself charging even after putting back in its sleeve. You have to cool it down to get it to turn off.
4. it said it could recharge in a day, but i found it charges to 3 bars over a day, but takes at least 2 full days to get back to 4 bars.
922347
For the price (with coupon code) it is an okay charger.  It is a little bulky and heavy.  Doesn't charge my Samsung Note 4 as fast as the wall charger it came with.  So I think the "Fast Charging" is a misnomer.  Otherwise it works and appears to hold its charge for a long time.
2327269
I've used the charger a few times already, and I'm loving it. It's not a fast-charger, which is a good thing, as I've heard that fast-charging batteries can reduce their lifespan. With the ability to charge 10 AA/AAA batteries at one time, that's not an issue. I do wish that it charged 12 AAA instead of 10 and 2 9V, but that's just nitpicking. The price and convenience of this unit grants it 5 stars despite the few shortcomings.
2404760
The charger has been working fine. It does what it says it is supposed to do, but it does feel cheap.

Be warned, this charger gets really hot, really fast. I wouldn't leave the room while this charger is running.
4595352
I use this on my Android tablets and phones. It does charge the devices a bit faster than a traditional charger.