And all of the Redis set/list operations are super valuable. You just need to be careful once you start relying on Redis at scale for things you take for granted when you start playing around with it... For example: zunionstores on lots of large sorted sets. "O(N)+O(M log(M)) with N being the sum of the sizes of the input sorted sets, and M being the number of elements in the resulting sorted set." When you start off using it, it's awesome and super fast, but before you know it, the blocking, single-threaded architecture will crash and burn if your data scales up. Luckily we have clustering now :)