If i might weigh in.....i've been doing two week cycles for quite awhile now. I'm doing them with two weeks on and 4 weeks off.
The theory is that 2 weeks isn't enough time for the juice to mess up you liver values so these short cycles are much safer. Also, it is possible to do one hell of alot of juice for 2 weeks with absolutely no side effects. Perhaps the best reason to use this method, is that you look like you are slowly gaining throughout the year instead of having to explain to people why your weight cycles 20 pounds or more when you are off versus on. I use a d'bol bridge for the first 3 of the 4 week period that i am off the juice. 20 mg a day the first thing in the morning when you wake up. This won't hamper your natural test recovery. I'm usually able to gain 8 to 10 pounds on a two week cycle. I know some of you are laughing at that and thinking "that's not shit, i gained 40 pounds on my 16 week cycle" true, but how much of that did you lose during the 16 weeks you were supposed to be off? I don't usually lose but 2 or 3 pounds while "off". So at in the worst possible scenerio, that's 5 pounds of real mucle in 6 weeks. Now do that all year long and you may gain 40 pounds of real muscle, while being off two thirds of the amount of time you were on. That translates into being an "old" bodybuilder some day instead of a dead one.
My cycle looks something like this: day 1-13 125mg of test prop., frontloading 200 mg on day one and two. day 1-13 75 mg of tren, frontloading 150mg on day one and two. 40 mg of dbol on day 1-14. I use clomid throughout 50 mg day while on and while off and i use HCG while on. I come down off the juice light as a feather and can hardly notice much of a change from off to on, except weight gain. Hope this helps. I'd like to hear from some of you who are trying this.