Been taking 15mg a day for a week. So far I haven't gained any muscle but I look fuller and I'd even say that I've lost a tiny bit of fat. My appetite is off the charts, though. I occasionally get extremely bad hunger pangs, like I'll be at work and suddenly my stomach wakes up and I need to eat a lot. Luckily, all my meals are prepped and I do a lot of work from home so it's nothing to just walk into the kitchen and throw some food in the microwave and eat it.
It definitely does cause a bit of water retention. My gym shoes feel a little tight around the ankles when they're normally not that snug.
Strength gains are also decent. I managed to put up some numbers very comfortably on bench.
Overall, I'm digging it. It sort of reminds me of Dbol for some reason.