I haven't had the opportunity to see or try one yet, but from the videos I've seen it appears to be very interesting for those who need those extra keys and want the feel of weighted keys as well. DGX-650

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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.)