Very impressed with J.K. Simmons performances as he switches between roles. Each of the characters he plays have some especially nuanced aspects that he pulls off remarkably well. Whether it's the different facial expressions, the different walks, the different voices, etc. he's one hell of an actor.
Also am a big fan of the storyline. I had wished the film "Parallels" would come back with some more content in the form of a TV series which has yet to happen and now I'm getting a major fix with Counterpart.