We recently acquired emx. The easiest thing that I've found was to go through the manual. It more or less follows the avi's and if you get stuck, you can look at the avi to find out whats going on. Our reseller has a two day class on it, but all the class did was follow the manual. (By manual, I mean the help topics that come with it, I printed them out.) I hope this helps you.
I tried it with a 30 day eval, but I didn't spend 30 days with it. I didn't care for it at all, but I have a lot of my own custom libraries including bases. I didn't like the goofy menu structure, but like most menus I'm sure you could get used to it.
I came from using Cadkey, so I don't have anything to compare it to. I have found it pretty easy to use. I haven't had the time to setup my own sliders, lifters etc.
and have found that it's been easier to use my own designs rather than attempting to use the catalogue ones. I find it hard to understand how to add motion (other than a straight open and close). I like the bom capability. In all, it seems like it will do anything that I'll need. Maybe something out there is better, but we chose pro-e as our Cadkey replacement.