UVC is fast, efficient and very easy to use. It really is awesome.
It keeps me organized every minute of the day.
The shared calendar, tasks, contacts, notes, file store, and secure file transferring between colleagues are all great features and used on a daily basis. You can choose to share some things and keep other things private, it's up to you to decide how much or how little is shared.
The email module has all the bells and whistles you would want and expect. The ability to share emails with co-workers and link emails to tasks and/or clients is a huge time saver, keeps things organized and is a well used feature.
All the modules work together seamlessly and that's important and they create efficiency which means more time for me to spend on what really counts, the client.