I pre-ordered this back in October ready for its release in January. Just watched it today and thought it was a good film. Fair do's, as other people have said the script and plot-line is nothing original, but at the same time I felt the director Shimmy has made a good job of giving you a feel for the time. For any youngster today would know nothing of cassette players, birmingham/oxford bags, spooner shoes, vests, record shops on corner streets etc. As for the music, it's tremendous! In my opinion you get a real feel for the time with the dance scenes (dance off excluded!). They've done a brilliant job of blending old documentary footage (most of which you can see on youtube) with the film footage and passing it off as the same, which I thought worked very well (compared to others that have tried the same).
As for the comment by the person who wanted a storyline more for his age group (now being in his 50s or whatever) I think you've got to appreciate that this film is not just for people like him that want to reminisce, but also for those who haven't got a clue about this genre and how much it meant to people at that time, like the teenagers of today, hence the 'coming of age' storyline.
At the end of the day, it opened my eyes to what it may have been like at the time (I was only 10 in 1974) and having loved the music since I first heard it, it makes me wish even more that I had been apart of it as it was happening. Enjoy the music, and try if you dare to stop your feet from tapping or from wanting to dance!