First, let's make it clear that yes, this has been released before under the name "Scandinavian Nights." Yes, it's the same material. But this remastered release has much better sound quality and puts the tracks in their proper concert order. It also has extensive liner notes, pictures, ticket stubs, posters, etc.
Now, the music itself. This recording is from the Deep Purple In Rock era. The concert is about two and a half hours total, which is ridiculous for seven songs. Four of the songs are based more on Ian Gillan's vocals (Speed King, Into the Fire, Child in Time, Black Night) and the other three (Paint It Black, Wring that Neck, Mandrake Root) are a lot of good instrumental jamming. Wring that Neck and Mandrake Root are half an hour EACH, and Child in Time is almost twenty minutes.
The best word to describe this concert is INTENSE. Right from the first chord in the Speed King intro, you know you're in for a wild ride, and Deep Purple don't disappoint. Child in Time, Speed King, and Black Night are all longer, louder, and more energetic than the Made in Japan versions, and it's neat to see a live take of Into the Fire. Gillan does a lot more screaming than on MiJ, but he pulls it off very well. Ritchie Blackmore and Jon Lord tear it up the whole time.
There are several differences between this and Made in Japan. First, and most obviously, this is pre-Machine Head and consequently doesn't have the hits from that album. If you want Smoke on the Water and the like, go get Made in Japan. Second, the tracks are a lot longer than any other live Purple recording. Only two songs (Into the Fire and Black Night, which is the encore) are under ten minutes. Third, this was before the tensions in the band appeared, and so everyone is looser, more energetic, and consequently we have a much more intense show.
If you're new to Purple, get MiJ first. If you're a fan, you owe it to yourself to get this. It surpasses Made in Japan in some ways. Listen to it and you'll hear what I mean.