I worked at Sheppard Mullin full-time (More than 3 years)
The culture in the San Francisco office is very warm and supportive.
There really aren't any downsides.
Precise, to the point, professional. Congenial. Thorough. One on one. Not necessarily knowledgeable about my particular area of law. Willing to engage in discussions for salary being commensurate with professional experience.