I've had this guy for about a 18 months and it is one of my favorites. It is slower than the HP Prime and the TI-nspire CX II CAS, but still blows the TI-89 Titanium out of the water as far as speed goes. The huge touchscreen gives it a unique UI that is easier to navigate than the TIs. I've found that this is the best of my collection for linear algebra, and it is the easiest of my CAS calculators to use.
Very nice. Looks a bit like an expert mobile phone with keyboard.
Do you have to type in the expressions, or can you write (with a pen) onto the touchscreen and the calculator will try to OCR the hand-written input?
No OCR, but it is heavily touch screen dependent. It's a resistive touchscreen instead of capacitive, so no multi-touch and a stylus is highly recommended.
Thank you for the details :)