So far I have only got a couple set pieces in DKS, from different sets. In D2:ED the set bonuses increased the more pieces you had equipped (starting with 2), but even with a full set I found better random loot to use. So far in DKS the random loot is not as good as it was in D2:ED (though merchant inventories are generally a lot better) and there were a bunch of sets added in DKS, so the situation may be different. More people have mentioned wearing sets in DKS, anyway.
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