The GIS data is a fairly complete package–the sample I downloaded included .pdfs, shapefiles, layer files, images and ArcMap project (.MXD) files used to generate the .pdfs. File sizes are larger because of the completeness. Feature classes have a moderate level of attribution.
The highlight, however, are the sample Keyhole Markup (KMZ) files of the of the St. George 30′ x 60′ quadrangle that can be viewed in Google Earth. Too cool.