It’s worth the install just for the edit command, which allows you to shell out to your favorite editor in order to edit more complex input. But there’s a lot of other good stuff there too.
May I write to you? Every week or so you'll get a SIGAVDI newsletter with a few handpicked links to interesting articles, talks, or resources; an update on what I've published lately; and some reflections at the intersection of software and life. Replies go directly to me, and I try to respond to every single one (eventually!)