I'm interested in hearing from those who either A) use Maven in an enterprise environment or B) tried to use Maven in an enterprise environment.

I work for a large company that is contemplating bringing in Maven into our environment. Currently we use OpenMake to build/merge and home-grown software to deploy code to 100+ servers running various platforms (eg. WAS and JBoss). OpenMake works fine for us however Maven does have some ideal features, most importantly being dependency management, but is it viable in a large environment? Also what headaches have/did you incur, if any, in maintaining a Maven environment.

Side note, I've read http://stackoverflow.com/questions/861382/why-does-maven-have-such-a-bad-rep, http://stackoverflow.com/questions/303853/what-are-your-impressions-of-maven, and a few other posts. It's interesting seeing the split between developers.