It mixed everything beautifully, and the cookies came out great. I made them with butter, which in the past had resulted in lots of spreading when they bake and being hard to get off the cookie sheet. Not this time - they came off beautifully.
I was impressed with how well the batter got mixed; with my old stand mixer, it started laboring with thick doughs. This one just zips right through them. Apparently, it was good to get the professional model. :)
Yay for having a new stand mixer!