Being a die-hard fan myself, i was THRILLED when this was on tv a couple of years ago, and have spent the following time trying to track it down on video. This is the closest i have come!
To put it bluntly, this is a fly-on-the-wall film about ABBA on tour in Australia. The director was given access to the group while on tour, so all the footage you see of them is real life. (although Tom Oliver - Lou from neighbours - does play their security guard for plot purposes ) It features a great number of live performances, many of which appear on the LIVE album.
Having said this, there is a plot woven in, that was apparently thought of on the plane to australia. It involves a luckless DJ making a radio documentary on the group, and his continually thwarted attempts to interview them. It's not exactly hard to follow, but it does provide some laughs, and there are some really cute moments when he interviews children. ( no actors! )
All in all this is great for the serious fan, but people that are not so interested may not find enough here to keep them watching. But if you are mad about the group like me, then it is well worth trying to get hold of it. The performances of I'm a Marionette and Get off the Carousel are unique, in that in the former case it is completely different to the original version on The Album, and in the latter case i have never found this song anywhere else, and they are two brilliant tracks on this movie! So it's worth owning them. The version of dancing queen is very different too, but the exact same performance can be found on the LIVE album.
Basically it's a good singalong feel-good easy to watch candid film, and if you can find it then its well worth it!