Apart from having real buttons, I don't see how that doesn't apply to people's phones just as well. Nonetheless, I agree that the TI-89 is a great product. It's

Apart from having real buttons, I don't see how that doesn't apply to people's phones just as well. Nonetheless, I agree that the TI-89 is a great product. It's also a 16 years old piece of electronics; there's no good reason for it to be as pricy as it is. And the value proposition for the TI graphing calculators which lack CAS abilities is even far worse. The pricing does not seem to reflect a truly competitive market.