Demos were cool and that (ThatNukemGuy and Sean Seanson do brilliant recap vids), but...
...what I really looked forward to were the Net Yaroze games that were published on the discs. Most of them were decent; some of them were utter shit; but some of them were absolute bangers.
That, and putting the discs in the CD player gave you a blind taste of some 90s techno choons - the drop in the Lifeforce Tenka track is top quality.