It is pretty good. The only thing that annoys me is that when it refreshes, the screen flashes (in back and white) multiple times, which disturbs me.
Every display like that which I’ve used could be put into a display mode where it shows only black/white, which will make updates a lot faster and result in the screen only flashing once per full update. For example, I have a very small black/white/red display which takes about six flashes and 15 seconds to complete a display update, but if I put it into black/white mode (i.e.: disabling support for red), then the update takes less than a second and only one flash.
That might be an option for you if you don’t mind giving up the third color!