Just got my 6S Plus today, the last one in the store! Luckily the 8 people in front of me didn't want it! I am loving the phone so far! Touch ID is super fast compared to my 6 Plus, and my first speed test was just under 140 Mb down on LTE. I'm not sure if that's accurate, but could it be with carrier aggregation?
Although, I feel like the carrier bundle is still a problem. I often drop down to 1X when I should at least be on 3G. The signal often switches to 3G eventually, but shouldn't that happen before the hard drop to 1X? This started the update after 19.1 for me.