The Good: CS2 rotor is quite good, pads and spares are easy to find. Pretty good power and modulation. Better than many other mechanical brakes at this price.
The Bad: Small pads. Why buy if you can get a BB7?
These brakes match up well when compared to low end mechanical brakes made by Clarks and Tektro, however they are less powerful, less reliable and do not last as well as Avid's BB7, which for a few dollars more is a much better brake. If these came on your bike upgrade these to BB7 when economical.