Pretty sure there are a couple threads on this topic, but maybe I'm thinking of XDA. My 5X works great on Sprint - of course YMMV based on where you live, but it should work as well as any other Sprint phone in your area.
Also loving my Nexus 5X on sprint. No wifi calling because of it being on Sprint the architecture is different. But other than that it's a great experience.
Flicked via the BlackBerry keyboard on my Nexus 5X