From what I read over time clen should be taken for 15 days in a row max. After that it just looses its 'power' so you have to stay off for another 15 days. Unless you take 'ketotifen' with it, 1mg a day. If you take ketotifen then you can stay on clen for a full month no problem and still have the full effect from it.
CC's cycle seems really good to me but it's also REALLY expensive,if you got the money I say go for it and add some test prop to the mix so your Willy doesn't refuse to stand.