"tell us what you like about this addon. Be specific and concise." Can I just say everything? It's got a bunch of features that roll20 is sorely lacking.
If you could figure out a way to make the map/page selection UI better, this addon would get rid of my biggest problems with roll20.
Edit: He did it, the absolute madman. The map/page selection menu is now actually usable with a large number of maps, so many possibilities have now opened up (That I've avoided due to the crappy default UI being a too large hassle to deal with)