It has been very helpful having all of our calendars within one place now! I used this system when it was called Intalio (now partway through some changes).
Nothing really - everything looks good but nothing stands out as being great or terrible at least from my perspective while using their product back then either so no complaints about what they have done since we left them over 2 years ago!! The ease-of creating an event calendar entry once you create/add items into another project list page makes things easier than before where there were multiple steps just trying find something online like Google Calendar etc.- also nice feature if searching other projects' pages suchs as meeting notes which can be entered directly onto those specific lists themselves too instead needing separate entries elsewhere.