- Form-factor - the size, weight and feel are great. It is barely noticeable in my belt holster.
- Screen - the screen seems tiny at first (and it is) but it is very clear and still display enough information.
- Call quality - I have found this phone to be much better than my old Nokia.
- Keyboard - the keyboard is quite small and takes a fair amount of practice to avoid hitting the wrong key. People with large hands probably can't use it.
- Screen in daylight - in daylight, the screen is unveiwable. My old Nokia was much at this.
- PDA functionality - the Palm is a much, much better PDA platform that MS Outlook. There are tons of little things that Palm does that are missing in Outlook. For instance, having a calendar event with no time; Outlook forces a time (or rather sets it to all-day), which doesn't make sense for things like birthdays. The todo function in Outlook lacks the polish of Palm. Also, the Smartphone edition of Windows Mobile doesn't come with a list function; I had to buy and 3rd party program for this. Lastly, the sync works much smarter in Palm. The Outlook sync always makes duplicates or recreates deleted items.
Overall, I enjoy the Blackjack and appreciate having only one device to haul around. If you need to go with Windows, I recommend it. But if I had to do it over again, I would have splurged and got a Treo.