I installed these on a Gretsch G5420T Electromatic.
They somehow didn't need to tense after installing at all. I did pull them but not too much and they kept pitch right away.
They maintained the intonation outstandingly well.
Tonewise: The sound of the 3 first strings is gonna be duller (Like an upright bass) because the lack of winding results in less harmonics, for Jazz this means the strings are more homogeneous form first to sixth and overall better for soft chords and avoid string friction sounds.
It helped with my thumb pick a lot, no more "grit grit grit" while playing.
They do have some small texture but is much softer than roundwound. I suggest to lubricate them right before use for smooth glides.
Used on a Loar arch top with P90. Very comfortable to play and solid sound. I cannot compare them as they are the only strings I have had on this guitar but they work well and last very well. The sound acoustically is a little wooden but I think it is more the guitar. Amplified they give good bass, clear treble and smooth arch top sound.
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