I have some and have not started using it yet - going to do another bulk and cut and then go on it. HOWEVER, there are many from the UK that are on something much like Test U (cannot remember its name) and they all love it. You have some serious dialing in to do - since it is so long lasting it takes forever to get it dialed in. But once dialed in, you save a LOT of pins for a long term cruise or for TRT.
So in another year or so I will be shifting to it. At least that is my current plan. I am almost healed up enough to restart my time with 3J and create an even bigger and better me first.