Surprisingly from a CW show, this is much more mature than their usual stuff. It has teenagers but is in no way a teen show. What I like most about it is the attention to detail and continuity. And, of course, the brooding, angsty love story, lol. The concept is not wildly original, but the actors are all good, it has some surprising twists and turns and great action sequences. Plus even though there's a love angle, its not a teenybopper love drama saga.
You should check it out.
Edit: And I LOVE Shane's acting. His face has so many nuances in expression - someone else will say something, and he will, like, move ONE hair on ONE eyebrow, lol, and his expression will tell you everything you need to know. He's insanely talented.