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Yes, it has some serious bugs. The calc will sometimes fail to turn on the screen, making you think the batteries are dead while they're draining away.
The old Nspire CAS+ prototype OS 1.0 can't open documents created by more recent production TI-Nspire OSes.The TI-Nspire CAS+ prototype OS 1.0 can't exchange data through USB with production TI-Nspire.If it's a money problem, you can find TI-Nspire CAS ClickPads allmost as cheap as TI-Nspire CAS+.You'll be able to do much more on them...
allso, if MP is all you're after, it pains me to say this (the MP oses have many programming-related bugs), but an 84+ with the latest OS has mathprint. 83+s don't though, unless you hack the OS (I think someone did it, but it causes problems)
Yes, significant work for trying to understand and reflash the CAS+ prototypes is currently underway, in another section of this forum and on the French-speaking TI-Bank forum. See, for example, http://ourl.ca/9688 The prospect of reflashing CAS+ prototypes with the OS of commercial CAS models seems bleak, though.
Actually the Prizm does have a very long battery life. I've had my Prizm since Christmas now and I use it for at least one hour everyday. In that time I have not changed the batteries once.