Comments Pro/Con about Mambo?

I’ve been hunting around for a high end content management system (CMS) for a couple sites I’m working with. I personally use MovableType for my CMS, but that’s really geared toward blog operations, rather than full site management, though it certainly can be used that way (witness my Business site, which is totally MT driven).
I came across Mambo while doing my research, and I have to say I’m mighty impressed with what I’m seeing. What I’d like to hear is feedback pro or con on the system. Has anyone used it, talked with folks who have used it, or had any experiences pro or con with it?
Thanks in advance 🙂