Kindles are on sale and I'm debating upgrading. I have the 10th gen (2018) Paperwhite and am thinking of upgrading. The Paperwhite is on sale for $100 and I can get another 20% off plus up to a $30 gift card with trading in my old one. I think the main benefits are more LEDs, adjustable LED warmth, and a bigger screen. Is it worth it? It seems like a really good deal...