I currently have a Kenwood TS 450S which works well. I operate from 40 meters to 10 meters normally. I am considering upgrading to a Kenwood TS590SG. Mainly just because it's a newer radio, and it does look nice )) . Would I benefit much from such an upgrade? Has anyone owned both radios before and could compare? Which features of the 590SG stand out which would make a difference to me? Thanks in advance.