I tried out KDP Groundwood paper
So in case anyone is interested, I tried out the new KDP Groundwood paper option.
Note: Both books printed in Poland
Very personal con: It makes the book more floppy, and I'm not a big fan of floppy books, but many people seem to prefer them.
Probably a result of that floppiness: The pages don't lie down as flat as the Cream paper, it's wavier from the side.
Pros:
Color: It's noticably more yellow/beige than the Cream paper, which is a big improvement. Warmer and friendlier.
Texture and feel: Feels much better, like a real paperback. I was always mostly satisfied with the KDP print quality, but it always felt "off", noticably different than trad books. With the Groundwood paper it lost a bit of that slightly sterile feel that said "print on demand".
Overall I'm quite happy with the results and I'll probably switch to the new paper.