Outstanding. Credible. Great characterisation and good storylines. I really can't praise it enough. It has the odd "slow" episode, but on the whole it's the best sci-fi I've ever seen on television. In fact, it's right up there with the first Alien, Star Wars, Running Silent, Blade Runner, Firefly etc. I really do recommend it to anyone who likes a really imaginative story, beautifully constructed and delivered for television or film. Excellent. I just hope they finish the story!