Yeah for me I need to squeak out as much battery as possible, my usage is heavy. 15PM would get pretty hot at times - not scorching like many reported prior to the software patch, but still warmer than I'd like. I think warmer than Apple would care to acknowledge, hence not only improving the thermals this year, but putting that into their marketing materials and mentioning it during the presentation. If you weren't seeking that improvement - ie didn't notice the difference on the 16PM or not wanting to keep the 16PM at any cost to improve it - then all the better for you. One less reason for you to upgrade.