C5-03 (had it for 2 days) is a vast improvement over 5800, but I still have a few suggestions:
1) Shortcut buttons are too few - 8-12 are appropiate, and 8 will fit the screen as it is now !
2) Sometimes you have to press the button more than once (it is not necessary) to get to the "destination" !
3) Handling C5-03 is not too easy with large fingers that are having arthrisis !
4) Which Symbian OS version is installed !
5) When you change to Microsoft OS "Mango", what is going to happen ?
Leif S. Jakobsen