I use a 2016 13in ntb at home and a 2017 15in at work. Recently, Apple replaced the battery on the 2016 for free and updated the keyboard to the newer model in the process. I couldn't be happier! The 15in is so light compared to the old 15in, I don't mind carrying it around with me, and using it at a cafe. The 13in is just a dream laptop: sturdy, great for small light programming, will play old games.