I got drawn into Sixcess (6s) Core through my interest in trying something new, such as the "Promised Sands" Campaign that makes use of the Sixcess core.
This Sixcess ruleset is one of the easiest I have used so far. It simply uses the standard 6-sided dice (one of the oldest and most popular dice sets). In fact, the whole rule system is designed to encourage quick and easy game play and thus avoids a common gaming pitfall, which plagues many other game systems. I will not mention names, but some of the other game systems actually see players argue over mechanics far too often, something that will not happen in 6s core.
Furthermore, the 6s rules are versatile enough to use in campaigns from traditional fantasy to science fiction to anything in between or even merged. Sixcess also introduces an innovative "faith" mechanic that actually allows characters to use the power of prayer and divine guidance in a very meaningful way (almost like many believe happens in real life).
The only minor draw-back is that even though there is some truly awesome artwork, a few of the artists did not do justice to this very innovative game setting. While, I know that great artists can make purchasing a game book expensive, it is still best to avoid mixing awesome artwork with other artwork of lesser quality.
All in all, the Sixcess Core book is great value for money, and will prove very useful when new Campaigns using this system come out, such as "Elfwood" and "Promised Sands".