Im looking at the WinMo version running on a QVGA phone. You can download the trial for 30 days and put it through its paces to make your own assessment.

SpaceTime is a mobile calculator and CAS package with script program support, very reasonably priced. I was wondering how it might compare to the TI and HP CAS in, for example, the HP 50g calculator.

Firstly, the ST graphing is simply amazing. this has to be a major plus point. By comparision, calculator graphing is hilariously slow and incompetant. It renders these in real-time 3D, check them out: