TI-30XS was awesome. IT had multiscreen and a sweet fraction mode so that you don't type fraction for a large equation wrong
I think I may just buy a new TI to see how it compares to the Casio.
I have been a BIG HP believer, for over 20 years owned nothing but hp, and purchased the hp 35s, but was not impressed, and after trying the Casio, went with that.
Here is why hp was so great, back in the day;
1. Buttons were great, you didn't have to look at the screen after every press of a button, like some of the ti and others, never sure if it registered, or not.
2. RPN has been much faster and more certain for me, and no parentheses. You could do running calculations, no need to stop and start with "=".
3. The overall take away is that you have confidence and speed in you are calculations.
The Casio now give me more confidence and speed, why? Because you can see the screen clearly and review the equations you typed in. It's now a new paradigm with the better screen; no longer does RPN do it for me. I was sure I would like the hp 35s better, but it was not even close, Casio hands down. The Casio has a good equation solver that can display the equations nicely and also an "Ans" key, which allows running calculations (using previous answer in next calculation) like the hp. So, no looking back now, no more hp. I will take a look at the TI multi view with 4 line display, a bit of a knock-off of the Casio, might be interesting.
BPH