I have about 6 of these chargers, spread across work, home, my bag and my parent's. The majority of my "gadgets" these days, are on micro-usb, so it's very convenient when I need to charge up.
Only two bits to note:
a) This is only a charger cable. It will not transfer data.
b) The retractable cable, sometimes doesn't work. It will stretch out but not catch. It's only happened on 1 out of the 6 though.
I would definitely recommend these to anybody who wants an easy to carry, easy to use charger cable.