Nexus 5, root or not?

What are the possible advantages/disadvantages of rooting the Nexus 5? I take it, that if you root, it's possible to get double tap to wake, which is something that I'd really like, as I find that the unlock button is placed a little bit too high on the side for fluent operation. Another thing is adblock working on both wifi and cellular data, which would be really nice. But what about OTA updates, will those still work after rooting as long as I don't go for a custom kernel? Why did you root? Why didn't you?