- The trebles are transparent. For some reason I thought they be non-transparent!
- The trebles are thinner. In fact the 3rd string is about the same thickness as a normal 2nd string. But then on the basses, the 4th string is a tiny bit thinner, the 6th string is a tiny bit thicker, neither enough to notice, the 5th string remains the same:
String | Nylon | Carbon 1st string | 0.71mm | 0.61mm 2nd string | 0.82mm | 0.69mm 3rd string | 1.02mm | 0.84mm 4th string | 0.74mm | 0.71mm 5th string | 0.89mm | 0.89mm 6th string | 1.09mm | 1.12mm
- The thinner trebles are noticeable, but did not cause me any issues.
- The trebles a brighter tone than nylon. Note the "carbon" in carbon strings means that the filament is made from fluorocarbon, which is essentially a hydrocarbon where all the hydrogens have been replaced with Fluorine. The Carbon-Fluorine bond is apparently the second strongest bond known next to Silicone-Fluorine. Interesting. Nylon on the other hand is a synthetic long-chain polymer which makes more sense as a fibre, but we've just run out of my chemistry knowledge.
- The basses are about the same tone as the standard EJ45's. Maybe slightly brighter, hard to say, you'd have to do a control test.
- The trebles feel "silkier", maybe "slipperier" might even be a better way to describe them. The basses have the same touch and feel as nylon wound, I didn't detect any difference.
- The trebles bedded in faster than nylon, as in, they stopped stretching and held their tune in less time. The basses maybe the same too, I find the nylon wound basses bed in reasonably quickly anyway. Note that I have been re-stringing the same way for a while - basses one twist at the bridge, 2nd/3rd treble two twists, 1st treble three twists. At the tuner I pull the string tight and loop it over itself so a minimum amount of turns to reach tune. This has always been the best way to get a fast bed-in for me.
- The tone lasted long enough, not double the time considering the double the price.
 No classical guitar ever holds its tune. Just you holding the guitar for a few minutes is enough to put a bit of body heat into it which changes the tuning...which you re-tune compensate...and then when done pack away...and then next time it is out of tune again because it is cold again...