Curiosity got the best of me, and I decided to test this in my Rickenbacker 4003S. Didn't expect much, but this thing is really solid piece of equipment.
I think the bass sounds better, it's way easier to get the intonation spot on, it even balances better due to added weight in the bridge. Nothing rattles in the bridge. This is super solid. Got the action pretty low, 3mm on 12th fret.
One star of for subpar screws that came with it. One snapped in two when I tightened it. I was able to get the stump out with pliers without damage to the bass, but I didn't use the included mounting screws after that.
It's also a bit fiddly to get the intonation right, lot easier than the original bridge though, so I'm pretty happy with it.