I just changed from an old Chorus 10-speed (circa 2001) to Chorus 12-speed (all mechanical). The shifting is a little better, but honestly, it was really good before. I mostly upgraded because I wanted to switch to a compact crankset and larger rear cassette (which required a new RD), and it was just time for a change. The new cranks are surely stiffer and lighter than my old alloy ones, as well. It's nice having the extra gears, too. In sum, it's an improvement, but not an earth shattering one. For the price of a Chorus groupset ($1050), it was worth it. For the price of Super Record, I'm not sure. I'd probably consider EPS as the next move up if I were in your shoes.