As overpriced as GW products are in general, often you can find excellent deal in their base sets. Strictly from the perspective of getting four squads of marines in their OG, most iconic armor, terminators, an uber-landraider and a dreadnought, plus characters...this is an excellent value. Tie in the new ruleset and all the doo-dads that come in the box, and you can't go wrong with this.Something else that is convenient (though it's because of the time period of Horus Heresy, where chaos hasn't been melting DNA) is that unlike previous base sets, you don't have two factions in the box, often leaving you with a bunch of models you have little use for...you instead get vanilla models that can be painted up as different chapters, or all as one chapter. I can't think of many other instances where this could be the case, but I fully appreciate it.I haven't really looked at the rules yet except reading through the fluff, so I can't comment on how this differs from 40K (seriously, what version are they up to this week?).Summary: I started back in Rogue Trader days, where the beakies were space marines. To me, this is like a slice of warm apple pie and a cold cider, and I've held onto my OG models for longer than many GW players have been alive at this point. Finally having them get a high quality rework gives me the opportunity to retire the old blobby models and use them as veteran troops in 40k.