Number crunching is stupid.
Math students should be using computers to visualize and manipulate math, and help them understand what it is they're solving for.
This is best done with modern, kick ass graphics, and on any modern tablet, can be done in real-time.
It's an embarrassment to the entire teaching profession that calculators are needed on any exam, but more over, it is doing a serious disservice to students to not use them for what they should be used for - math visualizing machines. The TI calculators are used by and large to hand-hold lazy teachers and provide them with busywork for students.
Also, HP48GX forever.. but I didn't need it until engineering school. I completed all of the math courses for my EE without a calculator - they weren't allowed by the math department, and rightly so.