Personally, I think going from chronically low testosterone levels to the high end of normal you're going to see some very nice results in the gym with solid training and diet. Like the brothers said, expect slow steady gains, and those are the ones that last. Wether or not you see this, however, the important benefits are the ones like better sleep, better focus, better mood,etc...Quality of life issues. And you're not going to hear anybody complain about better wood.
Bricks pretty well nailed it. Effects were more subtle than I thought they would be, especially at first. You will start seeing steady gains in the gym like when you were younger. One day you will wake up and realize you just fell a hell of lot better than did before you got on it.