Charged my Samsung tablet with it. All seemed OK, it was charging when I checked an hour later. So I left it overnight and the next morning the tablet seemed dead. I finally figured out it had been completely discharged. Recharged it with a different charger and repeated the process. Same thing, charges to 100% and then start discharging very fast as long as it is connected to the charger. Unplugging it stops the discharge.
I thought this was some kind of incompatibility between the charger and the Samsung tablet, but then I noticed the charger won't charge some of my other devices, including a Tribit bluetooth speaker for instance.
By the way, both chargers I got do the same, so either it is a design flaw or both chargers are defective. And yes, I tried different cables, same result each time.
Planning to return them.

UPDATE

This charger stopped working after 8 months. Combined with its other flaws, I do NOT recommend this charger.

ORIGINAL REVIEW BELOW

This is not a great charger. It does work, so I'm giving it 3 stars, but there are significant issues, among them:

1) When an iPad or iPhone is plugged into this charger, fingerprint recognition does not work.
2) When an iPad or iPhone is plugged into this charger, touchscreen response is wonky - it will put in 2 entries for a single keystroke, and zooming or scrolling are difficult, sometimes impossible.
3) Output is too low to charge a 1 amp device (e.g.: iPad) and a 0.5 amp device (e.g.: iPhone) simultaneously while using them. You CAN slowly recharge both while they are not in use, or charge an iPad alone while using it.
4) It is large enough that it often interferes with other plugs on a power-strip or extension cord
5) The prongs of the plug tend to fall out of outlets more easily than other chargers.

On the pro side, it is small, and has functioned reliably during the time I've used it.

I was really excited for these, but they were completely unusable. It took me less than 5 minutes to realize that they were going to drive me insane. The USB had to be perfectly placed it it wouldn’t work. Tried multiple USB cords and multiple outlets to rule that out. I ended up returning them.

Comes in a pair. Both worked initially. After 3-4 months of use, one stopped working. The other started making a high-pitched whining noise when charging around the same time. I stopped using the working one, as I became concerned about its safety and energy efficiency given the noise it was making.

Note that this product is not tested and certified by UL or any other nationally recognized testing laboratory. Thus is it not legal to use at workplaces in the USA, where OSHA requires such safety certification.

We purchased these for our electric toothbrushes and to maximize our outlets for our devices in the bedroom. There is no issue charging our toothbrushes and it charges our iPhones and iPads quicker than the standard chargers. Well worth it. The only issue is that they do take up more space on a power strip or wall outlet, so you cannot have multiple large plug in devices next to each other. Recommend this product.

I had a problem with one of my plugs and they are taking care of it. They stand behind their products and they have an excellent response time. My other plug works perfectly. No product on the market these days is perfect. the two most important things to me are reasonable price and great customer service. They fulfill both requirements.

I had zero problems with these plugs. I got the two pack of pink usb wall chargers and am very happy with them. They are cute, effective, and portable. I personally had no issues with getting them to connect properly, no issues with fitting my charging cords, no sparking or other hazards, and they fit well in the outlets without falling out like my old charger. The shop owners seem very responsive and interested in making sure customers are happy.

I gave them 3 stars because they don’t fit into the socket snugly, it always looks lik (and sometimes do) they’re going to fall out of the socket. But all in all, when they stay plugged in, they to the job.