I've had the Maestrale normal tension set on my best guitar for about six weeks now and couldn't be more impressed with the overall result. The set is very well balanced and the trebles are the real standout here, very unique. The intonation is spot on, which in my mind differentiates a good string from an unplayable one, and all strings in this set share that attribute. As has been mentioned in this thread before, these strings take a relatively long time to settle in, as they seem to elongate over time, but once they are tuned up, they tend to stay true for at least that sitting. Now, for the trebles: these have a certain something going on with them that I can't quite put my finger on (that's punny), but I know I adore them. Yes, they have a strange blue color to them and that's not what is important, but the sound - that's another thing entirely. They sing in all registers and cover every bit of the musical palette with such consistency it's really astonishing. And they do feel different to the touch. Some would qualify this as too stiff, or too whatever....but I have no issue with a treble string feeling stiff if the sound quality is as stunning as these are. They also have a certain tactile quality to them which is peculiar, they can squeak if you run your fingers along them lightly, probably due to the surface texture, which seems to be smooth, but with a slight amount of friction there. This also gives them a certain grip which feels more solid than conventional strings.
The big question is - are they worth the money? With a price at Strings By Mail pushing $30, they would have to be something special to warrant the cost. For me, they are worth it. I ordered 3 more sets after about a month of testing them out. After 6 weeks of playing, they hold up really well. If they only lasted half that time, I would probably just use them for performances.