i used 'dead' LR that hasn't seen water since 2007. i seeded 30lbs of baserock with 30lbs of new, fully cured live rock... also used two 30lb bags of 'aggralive' natures ocean live sand (they claim has live nitrifying bacteria to jumpstart and speed your cycle)
i cannot complain at all, not sure what part did it, if it was EPIC rock, or as-advertised sand, but my tank fully cycled in only 2 weeks.
already have fish, crabs, and a shrimp in there, who are loving the tank.