I have been using it for several years now and used it for 4 months at a time in spurts and also 6-8 week cycles.
I don't think safety is an issue, I just think that the body stops responding to supplements after a while and needs to be reset. Every 3 months or so I will take a week off and stop all supplements and just do cardio and eat 6 squares a day. (Different topic-but it helps keep me fresh and reset the pysche-especially dropping the supplements as I get so tired of popping pills!)
From the test booster-
The most noticeable effects are aggression, increased strength and size and libido and (when first kicking in) some acne.
It is a supplement that will give you slow even gains because it is raising your test levels 1.5-3 times normal -(depending on age and HPTA status).
You will feel the physiological results pretty quick, the tissue gains take a while to come.
Some people do report some type of estrogen effects but I don't recommend AI's -but that's a personal choice for those that want to cull any estro realted side effects.
From it never made sense to take another chemical that has to potential for some nasty side effects on it's own to block estrogen.
Besides -you lose some gains in my opinion if you don't allow the testosterone to aromatize.
I would recommend starting with a bottle -which is one months supply to try and see how you do. (240 capsules take 8 capsules a day 4 AM 4 Late PM