I have enjoyed working at Sandia. The compensation and benefits are some of the best in the region, and a high value is placed on education. Since Sandia is a government owned facility, there can be a good deal of bureaucracy, which can make progress hard. The culture at Sandia is very unique because of the diversity of disciplines required for day to day operation of a national lab. Promotion within Sandia usually requires an advanced educational degree, unless you are working in facilities, or logistics departments.