I enjoyed this so much but it only felt like a prologue, things were just getting started and then... it ended. Mind you, when I watched this I didn't know it was a pilot episode for a series, I only searched it after because the ending (as for a movie) was so unsatisfying.
I really love the concept though. I want more of it! A lot of people compare it to Sliders. Guess in the meantime (while waiting and hoping for Parallels to become a series) I will give it a go.