Hi,
We have been using EA for a while now, number of our clients, typically large companies, have been using it as well and, unbelievable as it is, I hear no complaints. Users seem to love the application for variety of reasons, from its feature set, to its user friendliness, and whole range of reasons in between.
I have seen EA used on number of projects, frequently large ones (dozens of users). I have also seen EA firmly incorporated into the companies' SDLC and therefore, directly or indirectly, impacting hundreds of people. This also says something about the trust EA has earned.
Personally, I have worked with all major modeling tools, and know the major players in detail. EA is my tool of choice, and would be one even without the amazing price of it (which obviously makes the whole deal a lot better).
Now I am sounding like a televangelist, so I better stop... I think I got my message across :-)
Hope this helps!
Bruno