Alexandria does everything our school needs
Our district has been using Alexandria for the past 7 years. It has all the features I wanted in a library automation system and then some. The tech support is awesome; I can call with any question, from "This doesn't seem to be working correctly for me right now" to "I'm having a brain cramp and forgot where to find ___." The only reason I didn't give it 5 stars is because there are a few things I can't configure exactly the way I would like, but it's possible those may be resolved when I update to v. 7.
