I have recently replaced my TX1000 with a TX2500 and despite a few little hiccups during the setup, I am very impressed with the improvements.The TX2500 is solid, light and sports a real touchscreen with wacom pen. Battery life is quite good and I recommend setting the power mode to “Balanced” rather than the standard “HP Recommended” that ships with the unit and manually adjusting the screen brightness to your tastes.
Physically, the TX2500 varies very little from the TX1000, where the major improvements lie are in the touchscreen and performance. My feeling about the TX1000 was that it was drastically underpowered and not up for the challenge of running Vista. The TX2500, however, feels powerful, balanced, and runs cool to boot.