Has anyone ever used one of these?

What are they like, what do they do?

Are they useful?

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Sustainiac pick-up is used in the neck position (for the magnetic field) and what is does is infinitely sustain a note or sound. A number of people have used them, look around the GB&C section of this forum and you will find some people that have one. I have been thinking about getting one for a while but idk. Steve Vai is also known for his use of the Fernandes Sustainer pickup. For a demonstration just youtube.
I'd personally go with a Fernandes sustainer, but sustainiacs are ok.
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