I've just put a set of these on following a set of Knobloch CX HTs. Here's what I think so far:
I have not stopped playing because it has given my guitar an interesting flavour. They are brighter than nylon but don't have the overtones or crystalline sound of carbons.
The appear more focused than carbon, more emphasis on the fundamental. They have a 'thicker' sound than carbons. It's like I now have a better perception of the individual strings and notes, more separation without so many overtones. I can say that I am enjoying these strings for the blues and folk music that I play.
For volume, they are loud enough and I am happy. Sometimes people say that carbon is perceived to be louder, but does not project as well. Something to do with all the overtones that do not project far but are easily heard by the player. These Rubino strings do sound slightly quieter than the knobloch CX HTs that I had on previously, but I believe it could be for a lack of those extra over tones. I would bet that they project equally well over a room or larger space. I would love to test this, or see some results. I may even guess that the Rubino strings project slightly better as they seem to have more emphasis on that fundamental (this is all speculation).
The tension is somewhat high, but nothing higher than carbon. for me it is fine, in fact I would prefer a slightly higher tension 3rd string but for most players I think there is plenty enough tension. I actually get a little buzz from the 3rd string on the 3rd, 4th and 5th fret when playing hard. I haven't had that before. I can also get some slight buzz on the 2nd string when playing very hard. I have flamenco guitar action.
They have only been on for one evening and a morning, so I will have to see how they settle in. I was pleasantly surprised that they had stretched very little over night, compared to when I first put a set of carbon strings on. They did however stretch a lot when installing the strings.
Camps Primera Negra A, Cordoba Mini M
Music I play/am learning currently: Acoustic blues and folk, Bert Jansch, John Fahey, Joseph Spence, Skip James, Gary Davis