They are GREAT! Each page is a laminated heavy poster board material A3 in size. There is a spiral binding down the center and facing pages create a larger map. The artwork is well done and covers a variety of income areas, so will work for a variety of areas of NHC. My expectations were really exceeded with this product and it is a purchase that I am quite happy with.
I prefer them in this form as I play in 15mm and can scale down the sheets to my liking, as well as print them without the grids (they give you both gridded and non-gridded options). They also have files specifically designed to be used by Tabletop Simulator or other online gaming systems (Role20), which is pretty cool when you don't even want to make table-space for a map.
Heroic Maps also has a set called "New Atami Back Alleys" which I found very useful for 5150. 18 sheets, with neon-lit streets, back alleys, and rooftops. I don't have to fight over the same patch of street time after time. And, if you're a glutton, they have "New Atami Plaza" with 18 more.