This is the official product video from Fernandes Guitars for their Sustainer, which uses a driver in the neck pickup to keep held notes ringing which are then picked up by the bridge pickup.
Plenty of player interviews and pure guitar shredding, with the crux of the matter summed up by Dean Pleasants of Suicidal Tendencies, who simply states, "I can't even play another guitar ...".
End testimonials come from Steve Vai, The Edge, Kerry King, Blues Saraceno, Neal Schon, and Adrian Belew