Got the ASHA 306, doesn't feel like as durable as the 5800XM. Touch is more responsive though.
Scroll bar, gone. Disabling auto rotate screen, gone. Screen brightness control, gone. Music player equalizer, gone. Smaller alphanumeric keypad. And less customization.
What I like are the threaded messages. Slide to unlock (less chance of unlocking "by itself" haha!). 40 games gift from nokia store. Integrated social networking apps. Scrolling the page while having the keypad on the screen. One touch wi-fi and bluetooth switch.