My needs are mostly note taking and reading technical PDFs, and for that the reMarkable is fantastic. I used it extensively while taking Calculus, which, it was great to use as many pages as I needed and to write as big as I wanted without worrying about "wasting" paper.
I miss background light from time to time, which I think is a great addition.
I'm not super familiar with alternatives so I can't say that is better than X or Y, but I personally have been moving as much as I can to single purpose electronic devices. That allows me to be more focus and not fight my device wanting to distract me. That takes out every eInk table that has android for me, I don't want a yet another multipurpose device that I need to develop discipline to use it!
On that line, I love my kindle, but that spends about 90% of the time in airplane mode, because, again, the kindle is for readin, the reMarkable for taking notes and reading Datasheets and such...
But, that's just me :-)