[GTALUG] Apache Traffic Server HA

Has anyone run Apache Traffic Server in production? I've used it for a proof-of-concept before, and I like it overall, but I'm about to recommend its use and would like to hear any horror stories. I'm planning on using it as a reverse proxy cache for a site that is expected to have a couple tens of thousands of active users at peak. I'd have HAProxy in front for HA, with a mirror setup of everything below it, talking to ATS, with another HAProxy behind ATS for load balancing the origin servers. Any comments welcome. Thanks! Greg