THIS AIN'T A DOCUMENTARY. I saw this film back in 2012 as part of a festival jury. What strikes me is that the producers are trying to market it as a documentary, while it is clearly not. At best, this film is a mockumentary. Its protagonists are compositions of several real-life people into cinematically and dramaturgically working characters. The "protagonists" themselves are played by well-known and less well-known actors. The overvoice is of a well-known actor. And unfortunately most of the "original footage" about skaters in the GDR is NOT ORIGFINAL FOOTAGE from some archive, but very smartly re-created footage. You could also say it is "re-enacted". That material looks and feels very authentic - but it is not.
In the version I saw there was NO reference in the closing titles about all this. Which is the big problem I have with this film. This COULD be a great film if the producers were sincere about what it is - a dramatized, fictionalized, re-created and very well shaped, colored and "artificially aged" mockumentary. But if I look at the category it is inserted here at Rotten Tomatoes... they apparently still follow the strategy of "don't ask, don't tell". Hence, once again: THIS AIN'T A DOCUMENTARY.