Concerning "Past Lives", disc 1 is great, to my ears. Of course, I'd had this years ago on vinyl in the name of "Live At Last". This is the exact same show/recording.
As for disc 2, the "Sabotage" era songs are immense, but the older tunes sound like poor bootlegs. Good for nostalgia, but not something I plan on listening to often. But disc 1 slays!
As for Purple, being that they're right there with Zep as my fav, I'm biased and like pretty much everything they've done.
The 1972/73 set (aka: Live in Scandinavia) is by far the better of the two. Its actually two shows: 1972 supporting the
soon to be released Machine Head and a small set (3 songs) recorded at NY's Hofstra University in 1973.
The 72 footage is in black n white, but the sound & picture clarity is near perfect! Seeing a young Gillan wail is a pleasure to behold! Blackmore is his usual sly self, and Lord's going NUTS on the keys. This is HIGHLY recommended! ANother great feature is that you can choose to hear some commentary which provides some fascinating insight into the time period. Unusually good, qualtity stuff. The 73 set is unique in that it's one of the VERY LAST shows with Gillan.
The 74 set (aka: Live at the Califnornia Jam) doesn't offer the same great picture quality (it was originally aired on WABC TV - this is that exact footage, cleaned up). However, the sound is fine. Coverdale sounds possessed (I always thought his voice was much stronger during his early days) and we have some footage of Hughes here, as well. This DVD is worth getting, however, for the infamous Blackmore "burn out" at the end of the set. While DESTROYING his strat, a pyro goes off a little too close for comfort - his hair catches fire momentarily! Classic rock moment, for sure.
Both are very reasonably priced - I picked up each for $12.
As for the CDs, again, I can only say they're mandatory - IF you like the Bolin Era of DP (1975-1975, Come Taste the Band). "Days May Come" is simply a disc comprised of a jam session, really. A few of the tunes are early versions of tracks that eventually made the "Taste" album, but the rest are 10+ minute long jams with superb sound quality. Coverdale sounds particularly Plant-like here in some of the long bluesy james. Again, there's no Blackmore, but Bolin was awesome in his own right!!
Definitely check out "Come Taste The Band" if you haven't already!