As my tour guide said, "Contrary to popular belief, Vegas does care about its history!" I did the tour of the Boneyard and it was great. It was about an hour long. You get a chance to walk around, take pictures, and hear about the history of the signs and some history of Las Vegas too. It was very interesting. I look forward to going back and seeing new additions to the Boneyard, and seeing the progression of pieces they finish and then display throughout Vegas.
This is picky, but my only complaint is that the tour group was just a little too large. This is a place you are going to want to take a lot of pictures and they allow plenty of time for that. With 30 or so others also walking around wanting pics, it was difficult to get pictures of the signs without someone standing in front of them. That being said, after waiting around for the group to clear the area and move on, I was able to get all of the pictures I wanted (people free!).
Also, at this point, YOU MUST book a tour ahead of time (they fill up, so try to book it 2 weeks ahead of time for Saturdays). Just go to the their website and it's easy to do.