I have never really given the Rubino strings enough of a chance, I don't think. I have never had breakage/wear issues, but I think Mimmo acknowledged that that was a problem initially. I have only ever had them on for a few days, while I was waiting on something else arriving, and from this and at least one other thread I gathered that their sound develops over time.
I would be interested to try the Granato set - which I think may be the Rubino trebles paired with different basses - those with a different ratio of metal winding to core material that have deep, pronounced lower end residuals, like the Ambra basses.
I would love it if you could buy singles from Aquila. I love the Seta basses, but the d3 doesn't do well - even when tuned to Db - and an Ambra d3 fits perfectly. Even the option of half sets would be great - the Cristallo trebles paired with the Seta basses are a combination I'm fond of, and there are other matches I'd like to try - I am waiting on an Ambra 2000 set arriving, only to pair the basses with Augustine Imperials.