the logitech split keyboards suck. i have one (corded) and i hate it. well, my complaint is the arrangement of the 2x3 keys above the arrow keys. and the overall crappiness of that keyboard. it's a personal issue since others do like that keyboard. my primary keyboard is the ms natural pro. i don't use the multimedia keys ;-).
plus, with USB, i can plug the wireless keyboard and mouse into this system if i need to.