Recently, a friend was raving about the reMarkable tablet, and I now use for reading those types of documents a fair bit. It’s a simple e-ink tablet. It’s larger than the Kindle, and feels like paper when you write. It doesn’t replace your Kindle. It’s not good for long-form. The reMarkable gives great space to think, but because of its limitations I wouldn’t recommend it to everyone. It’s for a very particular workflow. It can easily end up as another expensive shelf gadget.