Snapshot transaction Isolation levels: it really works as advertised?

We use snapshot isolation on a couple of our servers, including a high-contention replica of our billing system (updates are constantly being replicated), and there are dozens of queries/second that Select from it. Before we turned on snapshot isolation, long-running select queries would frequently block the billing data replication, to the point that the replica would be an hour or more out of date at time because the single-threaded replication service was blocked.

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