So HTC is committing to updates on this phone 15 days after a Nexus:
http://www.androidcentral.com/htc-commits-software-updates-one-a9-within-15-days-release-nexuses
Apparently they took Sense down a notch to speed up updates.
I have to admit, this is the most tempting phone for me at the end of 2015. It is pretty much the perfect combo of features:
-Premium build
-Micro SD slot with 32GB base
-Fast updates
-A non 810 or 808 SoC
-1080p screen
-A really good camera with OIS
-Fingerprint reader
-3GB of RAM
I don't know what else you could ask for except a larger battery. If the battery life tests on this thing look good I might get one to replace my M8. This is a lot more tempting to me than the Nexus 5X with its sad 2GB of RAM.