It's remarkable how easy Piazza is to use, given how much complexity it embodies; I wish I could say the same for the many other web-based technologies we're asked to use regularly at my university. I really appreciate it for its ability to help us stay organized when helping a large number of students with a large number of questions, without getting lost or overwhelmed. I also love seeing the extent to which students are able to help each other productively. It's excellent, and I plan to use it for next term's teaching as well.
I tell about Piazza to all my fellow instructors, and I believe that it's a fantastic service.
The students in my course, CS 137 at U. Waterloo like Piazza. For me, that's good enough. We get a lot of interaction compared to previous offerings that have used the old cumbersome newsgroup approach. Nothing beats a web-based solution for this younger generation.
Instructors can create a Piazza for their class with a single click.
Students and instructors are automatically enrolled with appropriate roles, based on the course roster.
When clicking on Piazza in LEARN, users are automatically signed in to Piazza, so there's no need to remember a separate user name and password.