I've purchased numerous expensive sync/charging cords in the past and the micro connector pins always lose their ability to charge/transmit data no matter how "good" they claim to be. After using these types of sync/charger cords for a period of time, they always fail or won't establish a reliable connection for charging. I love that these have a lifetime warranty. Also, by getting a set, I can put some in travel bags, at my desk, and any other locations I charge my phone. I travel a lot so it's nice to be able to keep one here and there.
PRODUCT FEATURES OR CONSIDERATIONS
These are USB 2.0. They transfer files at about 480 Mbit/s as opposed to the 12 Mbit/s for USB 1. USB 2.0 allows devices to temporarily draw 100 mA current after they have been attached. If a USB device is connected to a dedicated charger, maximum current drawn by the device may be as high as 1.8 A. Please note that USB 3.0, usually colored blue in the USB port, can reasonable be expected to achieve around 3.2 Gbit/s. If you transfer files a lot, it might be beneficial to find a USB 3.0 connector. If you are just charging your phone with this, it won't matter.
All-in-all, I think this is a great value. I think the lifetime warranty is a refreshing change with a product like this. I was offered this product free. In return, I promised that I would provide an unbiased review. I hope my review was helpful. If I can add anything further or if you have questions, please feel free to comment below.