A great show. Once you start, you just have to keep going. The producers really do a good job of drawing you in.
Season 1 was a bit scary and some of the sound effects were unnecessarily reminiscent of horror movies. This was a shame because the show has enough in its plot and storyline to be able to creep you out without having to artificially irritate you with the sound effects.
There are twists and turns in every episode that will keep you guessing. The ending of season 1 comes as a real shocker.
Season 2 is quite a switch of pace from season 1, and you get more comfortable watching it. Until, again, the final twist at the end.
One criticism is that when all is said and done, there appear to be a number of plot holes and unexplained acts by side characters that in hindsight, just seem to be there in order to throw you off the real mastermind. It is easy enough to create distractions - but if these are not resolved in the final analysis then they just become gratuitous sideshows.
Still, a great watch. Highly recommended.