Installed on Joomla 2.5 site - Found the calendar module conflicts with other modules on my site, but the installation documentation warned me of this - (basically the month would not change)- got round this issue by using the component with the plugin rather than the module and that worked. 1 issue i did come across was i need to change the title "BUSY" to "BOOKED" and i wanted to remove the "PARTLY" title completly from the front end calendar, I have yet to find this in the code, any help would be grateful! There is no post installation support that i can find, but the instal documents were complete enough for me to instal without incident so as long as you dont want to change anything its all good! shame there is no support via a forum post instal. Overall, if you need a basic booking calendar for your site, then this is definatly worth a visit.
By use of the custom CSS in the plugin and module the partly field(legend) can be hidden/removed. In the documentation is explained how to change the title in the langauge files.