I've used it and have colleagues that have used it a few companies. I would suggest to get the most out of it, you should set up some sort of tagged logging.

I've used it and have colleagues that have used it a few companies. I would suggest to get the most out of it, you should set up some sort of tagged logging. In Ruby, there's log4r + log4r-gelf to add additional context (e.g., Rails request GUID), that way you can easily and quickly link related messages. If you lack that flexibility, Graylog's extractors work rather nicely too. It's just a lot harder to manage, IMHO. It's really helpful being able to pull up all requests for a single user across the cluster. Or track the status of all components of a Sidekiq job. Or see which API requests are most popular. Etc.