I have the 40 W version. I've been using it for over four months. He has never failed me. I charged my iPad air, iPhone 5, and iPod touch 5. I also charge many battery packs using the charger. I recommend it!
Heres a copy of my review I posted on amazon last December:
The Anker 40W 5V/8A 5-Port USB wall charger is one of the most powerful wall chargers I have ever received.
Pros:
-8 amps of output power to the USB's
-5 USB ports (all 5 USB ports share the 8 amps of output power)
-Each USB port has a max output of 8 amps
-The USB ports are "Smart Ports" which adjust to how much power the device needs to charge at max speed
-Small and portable (size of a deck of card)
-Uses a 5ft power cord that allows the user to put the wall charger to a desired location
-Great for international use by using AC 100-240v input voltage
-Has overvoltage, overcurrent, overheating and short circuits protection
-Can charge and iPad Air, iPad 1, iPad 2 and iPad 3 each at 2 amps
-Can charge 5 tablets at once but is recommend for an overnight charge because the tablets are not charging at full speed
-Works with all USB chargeable phones, tablets and other USB chargeable devices
-No annoying LED status light
-Ideal for a family/person who has many tablets and smartphones (I have an iPad Air, iPhone 5 and an iPod touch 5 that works great with this wall charger)
-Makes an excellent gift
-Looks great
-Excellent price
-Well designed
-Very high quality construction
-18 month warranty
-UL listed (updated version!)
No cons found!
My wishes to make this product perfect:
-Make the max output 12 amps so 5 tablets, like an iPad, can charge at full speed at 2.4 amps
-Add micro suction on one side so I can stick it to my night stand
This is a very powerful and well-designed wall charger and I highly recommend it.