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 C/BRW, Córdoba C9 650 C/MH,
Juan Hernandez Torres 640 S/IRW, Sweet Tone 640 S/Lam.RW
German V. Rubio Concert 635 S/MP, German V. Rubio Estudio 635 S/P.E.
Kenny Hill Performance 630 DT/MP