I have a Casio now but wish I had a Handspring or Sony. The palm sync's with outlook and all other MS app's and more people have the Palm OS so you can trade data easier.

I know there have been significant improvments in Pocket PC and more people are using it but I still wish I had a Palm OS like the Sony. Also the Pocket PC's are much larger and I have found just the size issue alone is a reason to go with the sony. Also in light the Casio's screen is difficult to see. When you test the unit you wish to purchase take it outside in natural light and make sure you can see. Sony has the best screen for the time being.