Yes, I've got all four books and purchased them from Friends of the Mojave Road back when they were still available. I've ridden all 660 miles over the course of several trips but not in order of the books. On the first couple of trips, early 2000s, I rode with the guidebook and enlarged 8.5 x 11 copies of the individual maps.
Sadly, I've only got GPS tracks for maybe 1/2 to 1/3 of it. This is by far the cleanest GPS track. The others are low definition and fragmented.