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I had to buy it back in 8th grade for my algebra honors course. I've used it through high school and college math courses. However, I've been using it more as a financial calculator in my finance and accounting courses over the past few years.
I prefer this calculator over other financial calculators because everything can be seen on the screen. I hate having to do 1 step at a time and/or not being able to see my previously entered numbers.
I know what I'm doing in most calculus and finance related problems, so I usually do most of my math mentally and the 83 helps me organize my mind a little bit better than most calculators.
TVM Solver.... a time saver.
Ti83, I've only seen those a couple of times. The school checks them out to students who need to borrow a graphing calculator.