[Mouse]

It's worth it.
I upgraded my stock jumper plates to cardas rhodium plated copper. I'm not going to comment on these. I've had them in to long to remember how they sounded compared to OEM.
I swapped my cardas jumpers to demo 2 different nordost jumper cables. Their entry level jumper cable was night and day better than the cardas plates. I'm listening to the reference jumpers too. The difference between the two nordost is smaller, I can't hear the difference every song, but some songs it does make a difference.

I'll be keeping the Nordost reference speaker jumpers on my SF O3.
I'm surprised I could hear a difference honestly.
I'm getting a better focused soundstage which I never thought I'd pick up.
Nordost to cardas it's just more clear.
Nordost to Nordost reference has a slightly different tone. The human voice is a little louder on some songs, and on other's I can't hear the difference in the voice.

One thing I disliked with O3 is that it in my home the sound can be bright, and on a song recorded to bright can be painfully irritating. So many improvements are shaping the sound of my O3s back to perfection.
Olympica 3 sounds great in every showroom, and much less satisfying in my basement living room. While I still need to supplement these with giant subs for a giant room I'm really happy now.

Going from low cost/low tier AQ cables to high end Nordost loom really tamed the highs or distortion I was hearing in the highs. These jumpers really took it one big step further. I really underestimated these.