In skimming some of their pages, a couple things that I liked was that they've been in business since 1969 and that the entire US is covered by someone from one of their physical locations. NVSR won't be limited, geographically, as to which companies they can do business with. Canada is also covered if NVSR decides to do business there.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.--Albert Einstein