It charges enough to get you to Outlet(AC)
599428
I got 2 of these, One charges phone to about 60-80%
the other only charges phone to about 30-40%

I like the emergenciness of it but doesn't hold charge too long but it works
4273373
So far I like this.  The lights glow blue when its plugged in, so you know that it is ready for charging and you can find it easily in the dark, when its not plugged in the lights are off.  We have a lot devices in our house that need to be charged at a time and this gives a central location for items to be charged.  At the moment my son uses it because he has multiple devices that need to be charged I don't want him using up his outlets as he only has limited outlets.  We also like to use this for when we go on vacation because when we stay in hotels because I want to keep all the devices in one spot so chargers or devices don't get forgotten at the hotel.  This was a personal purchase.
2927644
It can charge multiple items and recharge itself quickly.
1738826
Easy to install, and has worked without any issues for the past 4 months.  It's used pretty much daily to charge my tablets, phones, and other random USB items.  The ports themselves seem solidly constructed, and I dont' foresee them breaking or becoming loose anytime soon.  For tablets it definitely puts out plenty of amperage, and is able to charge items much faster than my computer USB port or most cheap outlet plug-in chargers.  So I would say it's at least comparable to the 2A charger that came with the tablets, however I haven't actually tried measuring the max current output.
2325408
Perfect if you park your vehicle near an outlet...
3197288
This is a great unit to get if you need to use an AC outlet for anything while on the road.  If you want to use it for anything with high amperage you will need to hardwire it in otherwise it works fine with the DC outlets.
943170
Great for when you're traveling and need to turn one outlet into more!
3281324
It's a power outlet. Received on time and functional :)
1744996
It works, but is not very long. So if you need to charge you can't be far from the outlet.
2101701
Plugs right in and goes to work. No new software required - it's like an extension of your computer the same a strip outlet would be for an AC plug in your home. It seems a little fragile, but can't complain for the price. Would definitely reorder.
4179438
Combined with a 10 foot PlayStation controller extension cable, I can charge and still not feel guilty for taking up a outlet or two!
2388808
The unit's mounting goes up with just a few screws. Have your electrician wire in the outlet, plug the thing in and you are ready to charge at 6.2 KW. I still used a hose rack to coil the charging cord when not in use. And Georgia Power will reimburse about half the cost.
3598972
I like being able to charge my devices without an AC adapter.  My phone with it's case doesn't really fit in the side tray, but charging is really fast.
1335583
The charger is now the go to station for my wife and I to recharge Ipads, cell phones and Kindle. Works fast and the AC outlets make it very functional on the book shelf so I can use it as an AC access point where previously I had to have an extension cord available as there was no receptacle - the book shelf was placed in front of the outlet. The cord length is exactly what I needed to run down the cabinet and through a hole I placed in the back of the cabinet. The only deficiency is that you have to look closely to see that the on/off button is depressed or up. The suggestion  others had of a small LED would be helpful.
959226
This adapter plugs into the wall and turns out 12volts just like your in-car plugs.  It is effective and looks reliable (I haven't had it long enough to rate lifetime).  It does get pretty hot, so you need to be careful not to let the cords sit on top of the adapter while in use
4117465
It charges the batteries even when it takes a little bit too long to do so. But I can live with that.
4474806
Charges all of my overnight electronics (including a reserve battery) quickly and with no fuss.  It's not super-easy to mount solidly so inserting and removing cables doesn't push it around (I run a bar across mine and bolt the bar down) but not everyone needs that.