I have explained the benefits of using an e-ink device over physical books. They are easier to handle, can store your entire library for travel, let you buy books at lower prices, and make looking up words or taking notes effortless.
Another reason to get an e-ink tablet right now is that the e-reader market has never looked this good. There are now e-ink devices for practically every use case and budget, ranging from a pocket-friendly $69 to $600 and beyond.