I've used IronMq in production for about 6 months. It's easy to use but the uptime is terrible http://status.iron.io/history so if the messages are time sensitive I wouldn't recommend it. You should also queue the messages locally to ensure they end up in IronMq at all.
Sorry for your issues anfleene. Reliability is our top top priority. FWIW our uptime has been 99.9% over the past year - and this is far from where we want it to be.
We now also offer isolated clustering for production level highly available applications that need "4 nines" availability.
