There's a 40% discount for (undergraduate) students, making the price $47. I bought it when it was in Public Preview in '07, and love it.
The ability to sync with the app on my iPad mini is really nice, as it means that I always have immediate access to any paper I might want to refer to in conversation, regardless of whether I have an Internet connection.
The ability to sync with the app on my iPad mini is really nice, as it means that I always have immediate access to any paper I might want to refer to in conversation, regardless of whether I have an Internet connection.