I purchased this box set as it looked good value for money. I had heard that this series was exciting, but did not expect anything exceptional as I assumed we would have read about it in the papers, or at least heard about it. I was wrong. This is truly a game changer. From the opening scene, right till the end of series 4 I was totally engrossed. The dialog is as sharp as a razor. There are some wonderfully innovative shots. The excitement mounts up exponentially. Just when you think you've just seen the most exciting plot twist in a tv series, something even more exciting and unexpected happens. The characters are so well defined that you engage instantly. But just when you think you really understand a character, their behaviour changes in unexpected ways. Without giving too much away, I would recommend this to anyone you likes exciting tv drama. The best thing about this series, is that you almost seem to stumble upon it by accident, then realise that nothing you have ever watched on TV is in the same league. The worst thing is that all TV seems boring now compared to Breaking Bad.