LANL is a great place to work for scientists and people who like a culture that is established routine with little change or challenge. The culture is very closed. Many of the key people take years to trust someone new and it has a certain junior high aspect - hazing new comers, making up false rumors, political back stabbing, etc. If you like to work in a positive environment, or like to create change this is not the place to go. If you like government regulation and someplace where change rarely occurs it will be a great fit. Also if you are moving to the area make sure you get very involved in churches and community groups so you will be accepted.
Good pay and benefits, good work life balance
Closed unfriendly culture, slow to change