Looking for any success stories or warnings from others.

Ref: http://tech.trivago.com/2015/06/22/gollum/

What we like: Written in Go (awesome; fits with our stack nicely). Very flexible (define flows in a yaml file). Extensible (write your own plugins). Performant (ref has some stats vs. Logstash, Heka). Documentation (http://gollum.readthedocs.org/en/latest/).

Thanks! (edit: formatting)