I've been attending regularly the last 10 years.
It's fun, but also a spectacle. If you haven't been to Moab before, I wouldn't recommend going during EJS because of the crowds. The RR4W club runs a great event, but many of the people in town aren't registered for it and just go for the social activities, the vendor show, etc. Potato Salad Hill is always fun to watch during EJS. The machinery you see there is just amazing.