Donny, I totally understand your decision to retreat back to Yamaha. I myself have gone back and forth a number of times. I owned and operated a large recording studio up North for over 30 years. So when I listen to how far Yamaha has come from the original Tyros to the latest incarnation of the PSR series...I'm blown away. The realism of their solo sounds, ensemble sounds, along with the quality of their new drum kits are simply amazing.
Since I don't play out, the quality of their harmonizer isn't that important as I have a TC Voice Works Plus when I need it. My PA600 may soon be gone as I await the PSR-S970!
Jingleman