I've known two real life spies, one woman, one man, and they were both much more like the normal looking, self-reflective, capable pair in this film than the usual Hollywood shoot em up.
Also having lived as part of a behind the scenes entryist political group, the moments of non-self, no sense of place you get when leaving a fake life with nowhere to go were very realistically played by Tamara Taylor.
The mind games and rationalisations used to justify anything at all: such as Fred Melamed's character declaring "Love doesn't exist" and the spy's unwilling acceptance of it; are very true to life.
Most of the characters were unredeamable but all very likeable/unlikeable at the same time.
My only gripe was too much piano on the bg music. Would have been nice to mix it up a bit. Other than that I thoroughly enjoyed the characters, story and acting.