Went from 11 PM to 15 Pro, though I’ve only tested it thus far during set up (it’s a Christmas present), big jump. Would tend to agree year over year it’s strictly incremental now - but the gap 4 iterations down the line is noticeable for me at least. Brighter, quicker, USB C, not to mention the photo/video upgrades which are substantial. Sure, I can wait until next year and then the next and the next after that. It’s the most current model right now and for me and living in the present is where I am right now.