I have used Casio for years, but I had to buy Ti to take a GED high school equivalency test.I was pleasantly surprised to find it very easy to play with, and the display allows a student or a teacher to be very certain of his/her keystrokes.It is Solar, but has a battery backup, if you imagine you need that I like it, and will continue to use it.
Rating: [5 of 5 Stars!]