I bought these for a fretless Ibanez SRF700 Portamento. As it has a very sensitive, microphonic Piezo element in the bridge, it picks up a lot of string noise. The "soft" nylonwound external of the string provides a smooth, slick playing surface, and the steel core provides a lot of clarify!
I play a lot of harmonics, and if you crank open the bridge pickup and the piezo, it really sings as a fretless should.
The neck-through construction of the bass is good for sustain, and makes up for the slightly shorter sustain of the strings. They do not lack in sustain for fretted guitars, and bolt-on necks, but for a fretless you sometimes go into "ambient" stuff, and then you need clear, long sustain.
On a fretless you don't get a lot of wear on the strings, but on a fretted bass I suspect the lifetime of the strings will be a lot less, due to the softer windings.
They're also a lot kinder on your fretboard than steel/nickel strings (even if they're flatwound!).
These are a very strong competition for the LaBella nylons.
I bought these strings to fit a PJ bass, looking for that smooth and deep thump.
I was surprised to find that they retain a mid rich snap that gives them a very unique tone, although not for everyone's ears. It is not a traditional PBass sound, even when you roll off the tone knob, and they definitely don't work for a J Bass sharp attack. They are also capable of producing a decent slap tone, although (again) not a very common one.
Also, you should keep in mind that they have fairly low tension and will easily produce that aggressive snap against the frets, which may or may not be to your liking.
They are definitely worth the try if you're into trying different tones, but if you're of a more conservative nature I would probably skip them and go for a traditional flatwound.
I believe they may be amazing on a fretless and I'll probably have to buy myself one just so I can try them.
Pros: A different tone if you like that sort of thing, very smooth on the hands and the frets Cons: A different tone if you DON'T like that sort of thing
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