Pros: Easy to use, many features, Wi-Fi
Cons: expensive, slow Wi-Fi
The bottom line: T/X is good for the professional/student but a little much for the non-professional/student if it's just used for contacts and scheduling. It has a nice easy to read screen.
I started with Palm handspring devices over 6 years ago and have worked my way up through the ranks to the T/X. (The T/X is my fifth device). I must say I still own but no longer use or like the Treo 650- I went back to my Motorola Razr and Tungsten E. I now use my Motorola Razr and T/X.

I replaced my Tungsten E when the stylus kept falling out of its no longer tight storage area and the “E” was getting hard to power on. I have had the "E" for over four years.

You do not have to be a professional to have an electronic organizer. I use this for everyday life. I work part time in a hospital with irregular hours. I have children that need to go to the orthodontist, dentist, hockey practice and games, etc. It is much easier and neater for a parent to organize all members of the household on a PDA than in a paper notebook/calender. There is no need to worry about the T/X getting ripped or having to erase appointments that have changed or taking up too much space in your bag. I once had a physician have the nerve to ask me why I would need such a device- I told him I am a very busy parent that needs to worry about everyone else’s schedule in the home besides my own schedule.

The convenience of having the T/X sync up to a computer that everyone in the household can view is great. The T/X has a satisfying click when it turns on. It has an alarm option that signals you to appointments (that can be color coded for easy recognition of the event) and important dates. The screen is bright and colorful and can be changed in the preference screen to colors that work best for you. The T/X has a calculator. To enter data into the T/X you can literally write it in with the stylus or use the stylus to pick each letter, number, punctuation, etc. into a QWERTY keyboard on the screen, or enter it into your computer and sync it up. This is so much better than typing on a very tiny QWERTY keyboard that you would have with one of the Palm Treos.

The Tungsten T/X has Wi-Fi, Bluetooth, a 320x480 screen and 128MB memory. The screen is nice not just because it is bright but because it can be turned on it’s side, for better viewing, just by tapping the “flip” icon on the screen. It is an attractive organizer. The T/X is easy to use. It has a large enough font (that can be changed) that I do not need my glasses to read or write/type on it. I can store photos without worrying that I will bend or rip the photos.

For the professional and the student :

The T/X has Documents on the Go that is an Excel and Word compatible program that must be purchased.
Blue tooth functionality requires a blue tooth compatible device- such as a separate compatible phone. You might as well have one of the Treo phones for this.
Wi-Fi works in an area that has accessible Wi-Fi. It is a little slow but if you have to look up something it is a nice feature. I don’t think it works as nicely as my son’s Apple iPod touch.
The ability to add more memory with an SD card is often a necessity. I see physicians use their own T/X with an SD card to look up pharmacokinetic information for their patients. I am sure that the SD card is a necessity for other professions as well.

For the parent:

Speaking for my self the T/X is really more than I need. I had enough capabilities with my Tungsten E (Palm has replaced the E with the E2), but I could not resist the beautiful screen and capabilities. These next things are not necessary but I like to have these available to me: my photos and videos (This is available with the Tungsten E.), a few games- also available with the Tungsten E (free Mine Sweep, free Solitaire, and purchased Bejeweled) to keep my self or my teenaged children busy while we are stuck in a long wait somewhere, and Wi-Fi to check my work email.