A few more things since you asked:

1. I believe editing on the 800 is a snap. I love the drop down menus (think I'm on a Triton)
2. The toggle feature on the style buttons is very useful
3. The break button is incredible for live use
4. I like being able to link the harmonizer (2, 3-part with fx) to ots - oh, 2-part Everly Bros, etc - nice!
5. The 800 speakers are the very best on any 61 note keyboard
6. The pads follow in time, regardless on when engaged - forget the little imperfection on pads not ending (only a few and no big deal)
7. I love a touch screen, but that's me
8. Dual sequencer feature is pretty darn cool if ever needed & mp3 is a must
9. I thank Korg for intro/ending #2 - great to throw in your own chords
10. The styles and sounds are 2nd to none (IMO). BTW, I do many big band songs and there are plenty to choose from that work great

All said, some hate, some love - it's all up to your ears - good luck. Why don't you get on a plane and come to one of my shows

I'd better stop now before I get on a roll and offend anyone