FEATURES:

» New display upgrade--the new HP 50g display features a 30% increase in usable space over the HP 49g+

» New powerful SD card slot allows you to format your card right in the calculator and expand memory

» 2.5 MB total memory

» New larger equation library and 2300+ built-in functions--ideal for both professionals and students

» The choice of efficient RPN, Textbook or Algebraic data entry

The 50G is the successor to the 49g+ and have to say the keypad issue has been addressed with this model, and each key has a feel that is similar to the HP41 - just about perfect for data entry without needing to look at the keypad which is a major step forward from the HP49 line.

The display is bright and legible with good contrast, and there’s plenty of information here with a seven line stack in the default mode. However where the calculator loses its zing a little bit is the manual which though an improvement over the HP48/49 series, it is nowhere near as complete and useful as the HP41 series manuals were. 

Compared to the TI-89, the HP-50 seems more powerful. The CAS seems a little stronger, it has a lot more built-in mathematical, scientific, and engineering applications, and the hardware is far superior, it also has an infrared port and a SD expansion card, so it has no realistic memory limits. So if you want the most powerful portable mathematical system available in a handheld calculator, this is definitely a must-buy .