I've been using the technology for three years now, right from a very early alpha stage. This was mostly because I shared an office with the creators of the software. I've seen it evolve from being pretty rough and ready to being extremely functional. There are still a few things I don't like, but overall it's fantastic.
I'm a member of ten active groups, and am the administrator for a site that comprises six groups, and is likely to have many more. The things I like the best about the system are:
- the user management - where users can manage their account details in one place, while being members of many groups
- the centralised file storage (this makes a huge difference for committees and groups that aren't on the same IT infrastructure)
- the focus on good online group facilitation processes