My teacher encourages me to pick pieces from various periods, from Baroque to contemporary. I asked her about Bach and this is her suggestion. It didn't seem so hard when practiced slowly, but turned out tough (for me) to get to the speed with accuracy and desired touch. Yeah, I missed quite a few notes (and gosh they stand out!). I don't know how long it'll take for me to nail down all the details, so I record this for the time being.