Yep - coming from a 13 Pro Max the 15 Pro Max felt very underwhelming. The speakers are better on the 13 Pro Max - and I feel the screen is better too because it isn’t as ‘warm’. Largely though the screens are very similar and there is no justification for the upgrade. In terms of speed the 15PM is lightning quick but the 13PM isn’t exactly slow - with a full factory reset when iOS 17.1 comes out it’ll feel even faster. In terms of battery, after a few days I noticed no improvements in the battery drain. I ended up selling mine - sticking with the 13PM