I think you'll really enjoy 4-AcO-DMT... smoother and slower is definitely a good way to describe it. It's not nearly as jarring as mushrooms, and seems to contain the same approximate potential, and has the additional benefit of being more physically pleasurable.
In my limited experience, I'd say it was more fun, and almost as profound, but it lacked that absolute profundity that mushrooms have provided me with. Then again, I've only tripped on it once, so my opinion could totally fly out the window next time I use it.