Series 1 great, Series 2 good, Series 3 very good, but with each series the characters grow older and change a bit, new ones come in, plots evolve. No Series is perfect but this one tries to evolve which is a brave move and in the main the mostly succeed. The 80's backdrop is really well handled, particularly the music and fashion. Probably one of the best broad spectrum sci fi, mystery, whodunnit series ever, actually appealing to ages from 14 to 60, as it goes on how it handles the kids getting older will be fascinating.