Well, I've moved over to Kindle Print from Createspace. It was mostly pain-free, but there were some issues where I wasn't able to edit information that imported from Createspace that was supposed to have been removed.
Additionally, the previewer was very slow - and I couldn't download a .mobi version to check on Kindle until I contacted Amazon support.
Overall, I already had problems with Createspace with information not importing right, and this carried on into the KDP backend. I'll get it cleaned up.
Not seen the reporting yet as not sold any paperbacks since it completed earlier today, but I'll let everyone know how it goes.
In short, I feel happier having everything in one place instead of two.
However, I've not been happy with Createspace's cover printing so far and I doubt this will change - the colour balance keeps changing. The first ones I ordered were very grey, but the second ones were pinkish. The cover also doesn't loo very high-resolution. As my wife is looking to publish a series of kids picture books, we'll looking at Lightning Source/IngramSpark as an alternative.