Yes I have enjoyed the KMA. The main reason I bought it was the weight however the Pa600 is quite managable it's a nice compromise.
Amost other things I missed the songbook which is a great feature on the Pa series also the new touch screen is brilliant to use.
The Pa is also very easy to use because of the lack of buttons it utilises the touch screen very well.
All iall I'm very happy with the Pa600
Don't you miss the sliders at all? The reason I shied away from the Pa800 was because, coming from the i30 and Pa1XPro, I couldn't see me living with only a few sliders. The total lack of them puts me off the Pa600 as well.