@meganL But they really ARE excellent at making tubes, and given that needle-knitting in a circle is quite awkward, I have found my knitting machines to be quite useful. But no, I have not used them to make socks.
I've made scarves, shawls, and beanies for the most part. I even made a large rectangular open-front poncho for myself. Knit four large tubes and then steeked them, and then joined them all together.