Opinions on WebAssign?

I’m teaching the intro mechanics course next term, starting on Monday, and my colleagues who just finished teaching it in the Winter term used WebAssign to handle most of the homework. They speak very highly of it, so I’m probably going to use it next term.

I’m curious to know what other people think, though. The reasons my colleagues give for liking it sound good from a faculty perspective, but I’m not sure how well it would go over with students (for one thing, it’s another $15 on the price of the text). Does anybody have experience with using WebAssign, either as a student or as an instructor (more data are always good)?

If you’ve used it, and have an opinion, leave me a comment, or send me email (orzelc at steelypips, which is an org not a com), and let me know what you think.