The scrolling works well. It's a little weird, though, that it takes the mousewheel scrolling when I'm mousing over the comments. It makes sense, now that I've used it, it was just unexpected enough that I didn't think to try it the first time -- I wanted to focus on the element first.

I see now that it's acknowledging the mouseover focus by making the scrollbar visible, but maybe that should be more visually obvious. I didn't see it at first.