I've been using reMarkable for more than a year now. It's a very mediocre product with major software problems, BUT, I still will not trade mine with anyone for one simple reason: it allows me to disconnect and think. iPad, surface are all better in terms of features, but I get easily distracted. When I have to write something I am having real difficulty with, reMarkable works much better. Can't precisely explain why, but my guess is that it allows me to focus more deeply, like a blackboard or notebook.