Hi Jonathan. Every classroom in my building has a set. They are really convenient for quizzes/tests/exit tickets. You no longer have to grade by hand or run scantrons through the machine. I use them 2-3 times a week. When you export the students results, it shows you all of their answers in a nice spreadsheet, so you can easily identify ares where you may need to "reteach". They are really easy for the kids to use.
I have always enjoyed turning the smartboard into a whole classroom game. I am capturing those games that work especially well on my blog at http://www.smartboardteamgames.com.
Hope you find it useful.