They are not for everyone, but they are worth a try.
Thomastik-Infeld has always made superior strings, so I was eager to try a set of these John Pearse/Thomastik "Folk" on one of my nylon-strung guitars (Yamaha AEX500NS).
What a delight! These strings are very different from any other string.
1. The feel of these strings is soft soft like extra light steel, but with much more effective tension. The touch is quick and precise.
2. The sound is extraordinary. They have a remarkable sustain, and ring with crisp responsiveness, allowing for wide dynamic range.
3. The construction of these strings, 3 nylon tape wound on rope core (1st, 2nd,3rd,) and 3 silverplated copper flat wound on rope core (4th, 5th, 6th), is like none other I have ever played. The set comprises surprising gages (.016-.039). Yet they sing in amazing harmony, fresh and bright after many hours of playing. The guitar I have them on is a solid body electric nylon-string guitar. Excellent instrument, but as is typical with such electric NS guitars, the pickups are characteristically weak (without the possibility of an internal mic.) These Pearse/Thomastik strings COMPLETELY OVERCOME all such concerns. Based on the metal composition they are perfect when on electric or acoustic instruments.
The makers and purveyors of these strings assisted me with a concern I had after my first purchase. I received outstanding attention and care in resolving my issue, and came away with a belief that Pearse, Thomastik, and JustStrings all had my satisfaction as their top priority. Sensational companies.
The trebles blow every thing out there away without a doubt. All other nylon treble strings would be better off using a rubber band; and yes I've tried them all. My only wish would be that the Bass strings were some what higher in tension; this would be my only gripe. However there is nothing else like these out there and even though I've tried the recommended new technologies in nylon strings I end up regretting the expense and wonder why I bothered. The sensible graduation of the strings is a mighty plus instead of finding a thick dull G string and proceeding into rubberband territory.
They play easy and pretty.
Only drawback, some strings have produced unexplained undamped high harmonic ringing. When that happened I put tiny paper in nut groove.
found them a lot sooner.