Comment by cisstrd

It's less uncommon than you think, for example I know the HP Probooks do have that (and most likely many more)

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