Aren't those arrow keys a bit weird? Left and right keys are implemented as standard size keys, while up and down keys are so small and tiny. How do you work like that?
http://www.notebookcheck.net/fileadmin/_processed_/csm_Probo...
That being said I have no experience with such a keyboard, so I can't say
Friend of mine has one, he is happy with it, never particularly mentioned the arrow keys as a negative