Since the 89 is virtually the same thing as the 92 you already have, no it isn't. If it's the better software you want, get the Plus Module for half the price of the 89. If you just want the smaller case, then get the 89 but also sell your 92 to someone else. No point in having two of the same thing, right? >I own a TI92, but want a 89 to use at school because it is handheld, is it >worth buying?!