We're receiving roughly 200 msgs/s in our environment. We have it set up in an active/active environment across two data centers. It's been rock solid for us. It takes a little bit of time to get certain applications to send messages properly, but once you do, it's pure gold.

We are using NXLog on our Windows servers to send event log messages in GELF format. This allows us to truly delve in and search event logs so much easier than what we normally would be able to in Windows.