I really like the hours display. If ARC were cynical (which they are not- they are midwesternly genuinely nice), they could program it to say "Your Unit is Now Obsolete! It has been Superceded by the [X model]. You are now getting less from your system than you could be."
Not that any of that is true.
(I always liked the Sp-10 better than the SP-11, FWIW).