Wow ..... tonight went off without a hitch! I fully expected a great time, and I got it. I found that without the screen in front of me, I looked at the crowd more, instead of checking the time ... looking for more song choices ... it was a great way to get "back to basics" so to speak.
No lag time at all - the PA lets you have the song and/or style ready when you need it, and it's a simple button push to switch modes. No worries at all.
I did have one small problem ... not Korg, but with my ROLAND DP5 pedal for sustain. It just died. I always carry a spare, so I was OK, but man - I'd be lost without the sustain. The harmonies are EZ to trigger by hand, because you can either push the button with the RH or work the slider with the left, but I would be miserable with no sustain pedal.
So, RAVE reviews - the MP3 board is WELL worth the money, and this kb just continues to shine, day after day on my stages.
That teeny baby PA worked just as I predicted tonight too. I even had one "please turn it down" request!

(nothing new for this joint!)
That's all for now folks ... tomorrow, I'm back in school, so I need my rest!