If you are serious about playability,sound and durability you owe it to yourself to try any of the Knobloch strings. I use medium tension on my flamenco guitars and medium-high tension on my classic guitars. For now I have only used the nylon strings. They do need about 24 hours to get their true sound and this has been confirmed by Knobloch when I contacted them for questions on their other sets such as Normal, CX and QZ versions. Both sound and playability are sure all a matter of personal taste, but I have tried many highly rated and expensive strings and I am happy I tried Knobloch strings as these are the strings I now use most.