I have used it for many years. It is the lowest tension as I know. And it is the most expensive strings in the classical guitar world. One set is $40/$50 from SBM. And it is the only available one for classical guitar. In violin, pure silver strings have been accepted for long, long time...because it is very expensive, I only use for my Vowinkel guitar up till now.
It's sound is nice, very easy to play. But the D string life is not very long as you expected. Usually one set can be used for 1-2 months. If you can afford it, I would recommend you to use it.
Because it's tension is very low , the guitar top must be extremely sensitive/responsive.
As I know, Pepe Romero family and Eliot Fisk...use it.
Last edited by nmshu1 on Tue Aug 08, 2017 11:49 am, edited 3 times in total.
Otto Vowinkel Concert 650, Juan Hernandez Torres 640,
German V. Rubio Concert 635, Kenny Hill Performance 630,
Córdoba C9 650, Sweet Tone 640