I recently started watching this show as it is available for free streaming on Amazon Prime. I'm really enjoying it, I'll probably finish Season 1 tonight. I have been surprised by the quality of the show, the acting and even the effects. Initially I didn't watch because I thought it would be cancelled, but when I heard it was renewed for a 4th season I knew I had to watch. I've also really enjoyed how direct this show tends to be. When someone has a secret or problem, it generally gets resolved or brought into the light rather quickly instead of being a secret side plot for a long time. So if you're here considering whether or not to watch this show, give it a try.
As for us Stargate fans, Colin Alexander Cunningham who played the recurring USAF Major Paul Davis in SG-1 has a really cool role in Falling Skies which might peak your interest.