They're the best of the channels I've seen, but that's not saying much, because nothing compares to being there. For one thing, and it's not a small thing - you can experience a place without having a content creator constantly yattering away at you. Granted, not everybody has the ability or the resources to do any kind of trespassing-as-a-hobby, and it's not as if I myself have the resources to go to the same places they do, but even just going to the abandoned factory down the street is - if, again, you can do it - more worthwhile than their entire channel.
"you can experience a place without having a content creator constantly yattering away at you"
That all you hear are the activities and ambient environment is one of my favorite things about Primitive Technology. Also makes them really relaxing. A nice sleep aid, too.