Initial Impression
Love the large screen. In a design worthy of Apple, Palm made the T3 a slider. That is the bottom part of the device can slide up to make it a bit more compact. When you pull the bottom down, more screen is revealed. The virtual input pad is nice because when needed can be used to give you a bit more screen real estate.

Great Feature for Musicians
The voice recorder is really useful. As a songwriter, it is really cool to be able to record snippets of ideas as you have them. These can be transferred to your computer for permanent storage. Of course, you can enter lyrical ideas on the palm in memo-pad or whatever text program you prefer. So it is really a great device for musicians.

There are also some good Palm OS programs for the guitarist. Songbook is a great one for showing chords and lyrics to songs. It has has an extensive chord dictionary. Guitar Power is another that will give you info on a plethora of scales and chord theory.

Mp3 Capable
The device is also capable of mp3 playback which while I wouldn't normally use it as my mp3 player it can do it in a pinch or if you just want to travel light with just one device.

No Camera is a Good Thing
I like the fact that it doesn't have a camera. The cameras they stick on these things don't take good photos anyway and generally are just another thing to go wrong or to muck up the device. My Sony TH55 was a good example. Eventually the camera stopped working and due to poor engineering the camera button can be pushed too easily and everytime it gets pushed the device locks up. Terrible.

Conclusion
These are a good buy when you can find them in good shape used. They will be useful for years to come.