Readline—Unsupported

This would be a really great theme if the developer supported it in the least. Free or not, the best theme is worthless if unsupported. Given that it is not supported by the developer, there is no reason to use it. If you feel like hacking it, then it might be worth some time investment since it has good infrastructure to it, but if you want to do anything actually worthwhile with it, go with something else.