Some people swear by it.. others don't see much results..
The reviews that i really like are by the guys with -8% body fat that swear by it..
Generally reviews are mixed at doses of 40mcg per day... 50% positive and 50% inconclusive.
i've ran it at 50mcg a day, during pct, and noticed it probably helped my mood, and it definately helped my nuts come back quicker.. but nothing really noticeble mucsle wise.
I have also ran it mid cycle with slin, and I definately noticed my whole body was pumped, and cramped to high hell.. and i got muscle cramps and twitches in the strangest of places.. It was obvious it had a very synrgistic effect with slin and aas... I was growing uncontrollably it seemed.
I've recently ran it at 100mcg for 20 days... which just so happens to coincide with the time I moved my bench press from 10 x 225 to 10 x 260... or a max of 340. Was it coincidence? I think partly it was, but partly I had recovery out the ying yang, and I believe 100mcg is the effective stand alone dose.. but for best results aas should be right along side it.
Generally reviews seem to show people that are taking in excessess of 100mcg a day more often then not enjoy the effects.. and make noticable gains.
Again, though I'd highly recommend it in addition to a aas cycle... one will feed the other and vice versa.
I'd actually like to see someone run SD for 3 weeks along side of 100mcg+ igf per day with a high carb diet... I bet it's an awsome combination.