I love how easy it is to use with all our users at once! Sometimes you can get some errors but that's pretty much expected from any software out there these days (including Microsoft).
Not many cons really though as far user friendly goes - just wish they had more options available when creating new groups or adding people into an existing group. We've been able solve most of IT issues related too sharing files easily between employees now using privaize along side other file share applications like drop box etc which has made things so simple we no longer need them anymore!!