A friend showed me this album a while ago and I was very impressed then, though we were playing it so loud I didn't get to hear it properly. So I bought and every time I listen to it I am simply stunned. There is not one bad track on this album, it's as simple as that. The rendition of "Lazy" is nothing short of incredible, though you may want to turn the cacophonous intro down a little to save your eardrums.
One of the great things about this album is the sound quality. Often when you listen to a live track, it can sound gritty or distant. Every song on this sounds brilliant, with an incredible energy to match. The musicianship is nothing short of outstanding - every member sounds on top form (though according to the inside cover, which contains the story of made in Japan and some good photos of the band, Ian Gillan wasn't happy with some of his performances after having just got over bronchitis). Deep Purple show how well they can rock while mucking about like noone else can (see "Lazy" for prime examples of this).
There's two problems with this album, however. Firstly, when you next listen to one of Deep Purple's studio albums, it will sound dull. That's just how good this album is. Secondly, you shouldn't play either disc in your car because you WILL speed.