Just finished ep4 - really like too. This is how to develop an environment that is both cold-war retro and cutting edge at the same time. Characters you care about, some you probably hate, and those you aren't quite sure about. Keeping the mystery, while dripping just enough substance to keep you engaged.
Also first ep of "Here and Now" - it's basically "This is Us" but on HBO-roids. Depressingly raw (you've been warned), but promising. I actually hope its a limited run to keep the writing tight.