I love running this adventure; the maps make a huge difference. When I was a player and the DM didn't use the maps, we had a great deal of diffulty understanding where things were and we almost didn't survive the big boss fight. Also, these maps are in color and make it more exciting for the players. In roll20, you can use alt-click to line up the blue lines on the map with your roll20 lines (and right click to resize, if needed) so that it does line up properly.
[5 of 5 Stars!]