Good question. I have both the reMarkable 2 and the reMarkable Paper Pro. I really liked the reMarkable 2 but am a little underwhelmed with the Paper Pro. The colors are more muted that I expected and, more importantly, the writing just feels like a hard plastic tip on smooth glass. I love the feel of writing on the reMarkable 2 but it was just discontinued. I think the new black-and-white version uses the same pen and surface technology of the Paper Pro.
I think I prefer the size of the old 2 versus the larger Paper Pro, but it's hard going backward.
Overall the technology is intuitive and reliable - exactly what I got it for. When I was still working, I used it a lot for reading and marking-up .pdf files - especially when traveling. It really excels at that. I could send out the mark-up via email from the device - again exactly what I wanted from it.
I retired in April so I don't do the .pdf thing much anymore but I still grab one of the reMarkable several time a day. Overall, they are both elegant and certainly one of the finer pieces of technology. They work exactly like they're supposed to and I use them about 30 minutes/day. The are very good for creative efforts. It's quick and easy to get some ideas down on "paper" - faster, for me, than any computer and more convenient than paper because the editing and drawing tools.
Overall, they aren't life changing but I still really like having them around. At this point, I would miss them if someone took them away.
One note, though. I tried to use it as an e-reader and it just is not a good platform for that. If you are looking more for a reader, I'd suggest starting your research with one of the Kindles.