I just wanted to voice my opinion since I've read so many others here regarding KDP Print. After 16 paperbacks through CS, I thought I'd try one at KDP. I have no complaints as of today. I will see what the actual book looks like in a week or so and then make a final determination. But the process itself was a cakewalk.
Glad it worked for you! I don't think there was ever a question of the quality of the finished product.
But the KDP-print set up seems more difficult to many than the "guided" CS setup (which I assume you don't use, with that many books to your name). Many glitches regarding tiny size differences on covers or dpi have been reported on KDP-print when CS was fine.
And there's the biggy, extended distribution. Plus CS pays after 30 days instead of 60 and has live phone help. So certainly for the newbies in the US, CS remains the clear choice (for Europe, now that author copies/proof copies exist for KDP-print, that's the preferred venue).
I didn't really notice much difference in hand holding between the two when I played around with it in September. The cover creation tool had some different templates and UI but felt generally similar. The online book previewer was exactly the same tool, or near enough I couldn't tell them apart. My only real gripe was KDP suddenly errored on my PDF upload while CS said it was error free and good to go. The error was too generic to figure out what the problem was. That, plus the lack of basic extended distribution, led me to choose CS for my print book.