I just finished Continuum, and it had one of the more satisfying series endings that I've seen in a while. Spoilers will be saved for a bit later. Seasons 1 - 3 are up on Netflix now, and Season 4 (which recently ended) will probably make it's way there later this year.
Continuum is about a set of time travelers that come back from 2077 to change the future. From the beginning it sets up an interesting set of axes. Our protagonist is part of a militant protection services body, chasing a set of terrorists called Liber8. Except those terrorists are what you'd recognize as people standing up for civil liberties and basic freedoms.
The first season is brilliant, and while it dips and weaves a little in season 2, season 3 and 4 pulled it back together for a solid ride.
Minor spoilers beyond this point, you've been warned.
In thinking back through the series, ever season folds over a new timeline on the ones before it. We end with a time travel event that causes a new twist in an interesting way. Apparently the creators originally had between 7 to 10 seasons worth of layers they were thinking about. The rather abrupt introduction of the time traveler at the end of season 3 and early in 4 definitely feels a little rushed, and something they would have held onto for another year or so if the end was not in sight.
But, at least they got season 4 to wrap it up. And while it felt like we were marching a bit faster, it didn't feel forced. Pacing was one of the things that Continuum was always quite good at. Time wasn't just the plot, it was also a key part of the art of this show.
If you are looking for good new Sci Fi, definitely give this one a shot. It stays quite true to itself to the end, and stays firmly on it's rails the whole time.