This is just subjective, but I use it to read many books and enjoy it. I can scribble / highlight / notetake very easily and find the whole experience quite convenient.
Oh, I was just reading reviews (probably on reddit?), and that seemed to be a consistent opinion. It looks like a really cool device, but I've heard it's a little one-dimensional.
Edit: Looks like your link to the sibling comment is for extracting annotations from pdf. Are most of the books you're reading on remarkable in pdf format instead of epub?
Where did you hear that?