Lots of functionality, even the free version is very complete. Is able to deal with a lots of module instances on one page.
Ease of use
Very straightforward, lots of settings and customization. I used my own CCS to style everything to my customers' needs.
Never needed any support so can't really comment on this. Paid customers are able to use the forum for help so it seems well supported.
I can only comment on the tooltips inside the module editor and they seem clear enough for me.