I watched it all within a thirty six hour period. One thing I'll say right away is that I'm going slightly deaf and I tend not to watch programmes where people are using English as a second language because I often can't decipher what they're saying because of the accents. There was no problem here at all. All the actors and actresses spoke good, clear English. In addition there were subtitles even for the English dialogue.
The idea here was intriguing, a crime-free model city founded on the basis of twenty four/seven surveillance of everyone everywhere even in citizens' lavatories but with ironclad safeguards.
The other theme was that the idealistic founding principles were tainted by a terrible event in the past, parts of which had been covered up (not a spoiler, the first episode makes this clear) The very founder of the concept had hidden away knowledge about a crime that had led to the project's inauguration.
The sixth and final episode (IMDb has got it wrong) leaves us to contemplate the possible unravelling of the concept as blue lights are seen outside the miscreant's home. Can Concordia sustain itself in light of the shock? We are left to wonder. I'm glad I saw this through to the end. It was interesting enough to do so.
