Unstable, poor service, nice display

We were attracted to look and functionality of the calendar and purchased a Pro all-in-one bundle.
Can’t get basic support questions answered (even password recovery)
Images keep breaking, recent upgrade trashed the display and have to change settings from my end.
Takes up enormous server resources – we had to upgrade to a higher-end VPS to get reasonable performance.
Now looking at migrating to another calendar application.
Pity because the display, particularly the posterboard is nice.