Being an ex-pat Canadian and a Rush Fan (since 1979) I am slightly biased.
Having said that, Rockumentarys usually take a standard form. This one sort of does but not quite. It fills in all the gaps about the band and why John Rutsy left just when they got a record contract.
It explains the lack of media presence that the third greatest (in terms of album sales) band in the world did not get, and why all of a sudden they are.
The film is laced with interviews and performances in a perfect mix that just pulls you in. Totally absorbing, even my wife (who likes Rush, but not that much) could not stop watching.
Geddy, Alex and Neil have an excellent chemistry (even though Neil is still referred to as the New Guy) and it is great to see that they get on so well after 37 years + together.
Guest interviews from Mick Box (Uriah Heep), Jack Black and Gene Simmons (Kiss) plus many others (including the South Park creator).
The bonus features are great, especially the dinner at the Hunting Lodge (I think it is the Celtic Lodge in Nova Scotia).
On Blu-Ray, the video clips from the Snakes and Arrows tour are excellent (both sound and vision).
Most definitely a must for anyone who likes Rush or Rock music in general.