I just finished my first semester at a top 15 university. As for the course load, there was quite a bit of reading and paper writing, but it was not too stressful. As for statistics, I had a great professor who made it interesting and relatable, focusing more on interpreting the data than memorizing formulas, etc. Our program emphasizes that grades no longer matter (or are not the sole focus of the program)--it is now about research productivity and thinking critically and innovatively. The difficulty was not the material (as most of us at least found it interesting), but balancing TAing, RAing, coursework, and outside reading in preparation for our master's thesis.