I finally managed to find a retail shop to try out the Sony Ericsson Xperia Pro.
First impressions are not encouraging. The key edges are straight instead of being domed, which enable one's thumbs to move around the keyboard.
Also, the keys are slightly softly sprung. They don't provide the positive clicky feeling I have with my Sony Ericsson X10 Mini Pro.
The sales assistant was hovering around constantly, asking questions, so I didn't have a lot of time to really test the keyboard and camera.
Guess I'll have to find another shop to try it again. Now tempted to reconsider the HTC ChaCha even with its inherent problems of insufficient memory, short battery life, and slow processor. The keyboard on the ChaCha is that good.