I bought 2 different cords through Iniu, models DI-D5C and DI-D3C.. From what I can tell, the only difference I can find is that the design on the ends of the plugs are different, and the one has 6.6 feet cords, while the other set has 6 feet cords in them (which is true.. I compared them both).. Both have the same rating, bends, speeds, amps, etc.. Oh yea, and a little difference in price.. But not much..If you do not care about the end and its color, I would recommend getting the DI-D5C version because.. Well, they are cheaper.. but seem to be the same quality, etc..I tested the cords and what I got in results was this.. What I used to test was a 5 volt 2 amp USB wall charger, on a N200 phone with a 56% charge on the phone, and using a USB tester to test the amps and volts.. With the 3 foot cable, I got 2.10 amps (which is pretty much the max you can get out of a 2 amp charger), and with the 10 foot cable, I got 1.09 amps.. I am not sure if it is because the 10' cable was so long that it put resistance in there, but I do know the longer the cable, the more resistance you will get, and so the amps will be lower the longer the cord is.. This is standard with every cord of every brand that I have tried. Maybe more amps at the front end would help too??The cords are pretty flexible, and have a nice feel to them.. They snap in, and hold in place pretty good in my phone. They feel to be of a decent quality, and have held up pretty good so far.. They have a light on the end to let you know if there is power running through the cable.. I like this just because, in my car, I can not tell you how many times a cord has been tugged on, just a little, and the cigarette lighter plug to USB adapter comes out of the plug just a little, and loses connection, and my USB cord power gets cut off.. When you consider it is right by the cup holders, it is easy to do.. With these, when that happens, I can see just by looking at the USB C end if that adapter came loose or not..I love the fact that they have a nice rubber band on them to tie the cord up when not in use, or when you want to carry it around.. and the band is attached right to the cord, so it is not loose where you will lose it and it will not fall off... Much better then using twist ties (twisties to some people), which break over time, don't hold great, etc.. This is a good bonus.I have not tested speeds on them, because to be honest.. I really do not care too much.. Most of my use for them is to charge things.. I have seen people say that they like that it is in a nice plastic case to give them more protection during shipping.. My opinion, to each their own.. Yes, it does give better protection.. But to be honest, I have never gotten a cord that was damaged that was shipped in a resealable bag.. and to me, in a way, the more packing there is, the more garbage I have to throw out.. So it all depends on how you look at things.Overall, I have no complaints about them so far..One side note.. I did see someone saying that these do not fast charge.. It makes me wonder one of 2 things.. First, what was the cord length that they tried.. As I stated, the longer the cord, the less amps are going to go through.. Maybe try a shorter cord?? Or also, what is the amps of the source that you are using.. I have seen some USB power sources that only supported 1 amp power.. If you have these problems, check these things because either one of them could be the problem..