Guitar Center takes trade-ins on various musical instruments, amps and accessories. They closely inspect each and every piece of equipment when it comes in for trade-in, and usually give that person a great deal. Additionally, at least at one time, they offered to match Internet prices.
I would have no qualms purchasing used gear from them,
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)