OK, I understand not everyone either knows about or can afford these latest offerings - I am still in trouble with my wife for splashing out on the Space Ritual deluxe edition (but that's a story best forgotten; the argument really took off after I pointed out we spent more than that on a meal to celebrate her birthday).
To the matter at hand: a seven-CD and two Blu-ray reissue:
CD1: a slightly expanded and revised copy of the remastered CD (1996) - no appreciable improvement in sound quality.
The bonus tracks (10-16):
10: It's So Easy (Studio Version) - sounds very different from the B-side single (which, if memory serves, is an overdubbed live recording from the Edmonton Sundown concert)
11: You'd Better Believe It - I think this has appeared elsewhere, and this is not a great version - far prefer the original live overdub from the album.
12: Wind of Change (alternate version) - had this version for years, just a filler track (I am actually rather fond of the track and it makes a great extended version of WOC when cross fgaded with album version
13-16 Reissues of the Psychedelic Warlords, You'd Better Believe It and Paradox single versions - more filler
CD2 & CD3 - The Timothy Leary Benefit Concert Edmonton Sundown, January 25th, 1974 - previously unreleased and the source of three live overdubbed tracks on HOTMG, the band are tighter than a duck's arse in water; the only fly in the ointment is the track America (sounds like Bob Calvert), which is some overwrought message about Leary, whom most of the audience were probably unaware of. Great concert. BTW I hate the D-Rider version here - Brock's opening sounds like he's trying to sabotage the song, sloppy, and Turner vocal is terribly out of tune ooooooooooooh!
CD4 & CD5 - A remaster of 1997's The 1999 Party - no significant improvement in sound quality - filler
CD6 & CD7 - Previously unreleased comcert from The 1999 Party Tour Allen Theatre, Cleveland, March 22nd, 1974 (the night after the previous CDs source) - it's very similar and a bit looser than the Chicago recording.
BDR1 - two versions of the nine-track HOTMG, the remaster of the 1974 mix here is a revelation. The day I got the box set, I listened three times in succession, each time hearing elements mostly missing from the original mix - Goat Willow and the title track I've skipped for years were no longer skipped. The New Mix version detracts rather than enhances the original
BDR2 - Basically CDs 6&7 but with better sound quality.
Would I recommend the box set - I don't regret the arguments it caused, as I have got to hear the Edmonton Sundown concert finally, and the remaster at 24Bits/96kHz is dabomb!