Actually, when properly tuned, Yamaha's newer vocal processors are actually pretty darned good. I agree, they are not in the same league as most stand alone processors, but for an onboard processor, in the hands of a good singer, they sound surprisingly good. And, in reality, most audiences would not know the difference. Vocal harmony is still just a gimmick that provides some diversity for vocalist, and is especially helpful during a live performance.
All the best,
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.)