I have one and it's great.
Very simple to use but it's analog and sounds so warm and smooth it's just a pleasure to listen to. The modulation can be adjusted via an internal trimpot but even at it's max, it is not very apparent.
The oscillations capable with this pedal are amazing, noises, gurgles, feedbacks, etc.
Look in the'Bay I've seen them New for a lot less than in stores.
As long as you don't want tap tempo, presets or dozens of features, IME the Carbon Copy is the way to go.
It even looks great, green sparkle finish and 2 blue LEDs
