I got my 16gb N4 ordered pretty soon after release (finally delivered early January). It's actually the first Android phone I liked out of the box, without feeling slow/sluggish. It's now my fourth android phone (first was the G1). Each one seemed like if it were just a little faster, I'd be happy with it.
It's actually a little more responsive than my 2012 model Nexus 7 tablet. Which is why I've been considering getting a new N7.
I've also played with both using the Chromecast, and have to say it's pretty nice and works smoother for Netflix than my typical pattern in the past, which was queue up stuff on my tablet/phone, then use my roku (bedroom) or the tv's built in player (living room).
Can't say enough positive about this phone.