A short review of the bonus discs for Neroli and Shutov Assembly:
Neroli: Disc 2 is a single long-Form track called New Space Music. This is a thick, bassy, droney piece which ebbs and recedes. It's ok but nothing essential for ambient fans. It actually sounds a lot like some of Celer's stuff.
The Shutov Assembly: Disc 2 is not what I was expecting so buyer beware. Music was created during the same period but save for two of the seven tracks, the music is strange and rhythmic instead of drifting and ambient. If you hoped to get more like Shutov tracks you will be disappointed.
These reissues did remind me how good the original albums are. I would probably recommend to keep your original CDs and save your money, unless you are a completist or collector.