Finished it a couple days back. It was generally pretty good. The mood of the show is constant and great. The music is pretty stressful. The acting is very... german. I'm not sure I understood everything or catch every little nuance, and I can't vouch that everything actually makes sense in the show (but can anything truly make sense when time-travel is concerned?), but I binged it and enjoyed it.
I tried the first episode and thought the story had promise but the English dubbing drained my interest in it. I would much prefer if they did subtitles instead. Maybe I'll give it another go but for the moment it's not drawing me back any time soon.