Somewhat ironic to me. I recall in my few months in Hong Kong, they told me they had standardized testing for pretty much every level of schooling. They had a LIST of calculators you could use. Each of these was STAMPED AND ETCHED with a certification marking on the front. Each test you were allowed
1 HB pencil
1 eraser
1 calculator
That's IT. Anything else was not allowed in. PERIOD. People laughed at me when I told them about 'open book tests'. Hell some people were genuinely confused as to what that concept was, even after explaining it. It just didn't make sense to them.
One group of cheaters went high tech though. Had mic and speaker hidden in their glasses. Relayed the question to a van outside that had around 10 people inside furiously solving the problems in real time. Then relayed those answer to anyone who 'paid' them through the same glasses. I think people were paying like $5k for it.
Ok yeah so back to the calculator. If you're not really 'into' any vendor right now (TI/Casio/etc) then really they're all kinda the same, at least in terms of there are price points for each vendor that do the same thing relatively. The TI83/84 can jailbreak a PS3 if you're really into that and have an old PS3
But the Casio homebrew community is also pretty robust too so you're not losing out either. But that Casio one is kind of on the 'low' end of the Casio lineup. It's not really comparable to the TI83/84. Just depends if you use the functionality really.