Aside from a collection of Bowie's albums from 1996 to 2001, what's really valuable in this set are the bonus material discs. Instead of having to buy single after single for outtakes, remixes, demos, alternates, etc., this release allows you to not only get the best of that kind of material, but nearly all of it! You do miss out on a few tracks from singles, like certain edits and whatnot, but it isn't much to freight over.
1st bmd: Outside
What is disappointing about this disc is that Bowie created hours of material for this album that never got released... officially. Instead of hearing all that material, except for the newer tracks 'Nothing To Be Desired' and 'Get Real', all this CD contains are remixes, some good, most not outstanding.
2nd bmd: Earthling
This is another rather uninteresting disc filled with remixes and little else; fortunately, though, there really aren't any b-sides or outtakes from this album, only remixes and edits, so you're not missing out. The 'I'm Afraid of Americans' remixes done by Trent Reznor are incredible, but other than that and the Tao Jones Index performances, this disc is a miss. It also could have included the newer version of the Tin Machine song 'I Can't Read'.
3rd bmd: 'Hours...'
The original album in my opinion was rather dull; some good tracks throughout, it made Bowie sound like he was 80. I especially disliked the track 'If I'm dreaming my life', ugh, that song is so boring. On the other hand, the extra material is awesome! All the remixes are fantastic, including the Beck and Marius De Vries versions. An edit of 'The Pretty things...' is thrown in oddly, but it's actually not a bad edit. The other mixes of this song are good listens as well. I actually first heard of Bowie from his remix on the film 'Stigmata', which really had an impact on me. The Omikron versions really don't sound much different than they do on 'Hours...', but it's good to have them on here. Also, you get to hear a rock version of 'Thursday's Child' and the demo of 'Seven' which are both stand-out tracks. But of most value are the 4 (four!) superb outtakes which, in my opinion, all should have made it onto the album either to add more length or replace some of the album's dullards, but Bowie seemed to want a more down to earth mix of songs, which the outtakes wouldn't really fit into, except for 'We All Go Through', an incredible song.
4th bmd: Heathen
The closest you'll ever get to hearing the unreleased 'Toy' album is all right here on this disc. The 'Toy' project was originally going to be made of reworked songs from Bowie's 60's material, along with a few new tracks most of which ended up being placed on the Heathen album. The two remixes are very good and unique; great additions to the Heathen project. But there is a reason this older material wasn't successful back in the 60's/early 70's, because it doesn't display Bowie's talented songwriting, so it feels somewhat like a devolution with tracks 'Baby Loves That Way', 'Shadow Man', and 'You've Got a habit...'; the other reworkings, namely 'Conversation Piece' and 'Wood Jackson' are great and definitely worth repeated listens. A newer song, 'Safe', was originally for a Rugrats movie, but the scene in which the song appeared was dropped, along with the song (it's actually not the same version, but was handed over to producer Visconti after being dropped); I really like this track personally, and I think it should've been put either on Heathen or made into its own single. And don't forget another lost gem, the 1979 reworking of 'Panic In Detroit'; this version is honestly the best, because it combines the glam rock Bowie with the eclectic, eccentric progressive rock Berlin Bowie, very cool track. What's really bothersome though is that a number of unreleased 'Toy' tracks still have not seen the light of day, a very unfair call.
I'm surprised this one is so short, only 8 tracks, but is still packed with awesome tracks. First are a few outtakes, all great tracks, with the super fun cover of 'Love Missile F1-11', the 'Rebel Rebel' re-version and a few mixes of 'Rebel Never Gets Old', a cool fan-made mix of 'Rebel Rebel' (both original and newer versions) and 'Never Get Old'. Still, this Cd could've/should've included the Underworld film remix of 'Bring Me The Disco King', but oh well.
Overall, some misses, some major hits, and a ton of necessary material for any Bowie fan.