I worked as a freelance interpreter (Asian language) for 5-10 years with LATN. I work with a couple of other interpretation service agencies. LATN tends to offer more steady work. They gave better advance notice for assignments. It is a well run, well organized company with professional employees. Treat its freelancers fairly. They ensure the interpreters they assign are qualified.
Cons
Interpreters get paid at a lower hourly rate than other agencies but they seem to get large stable contracts with hospitals for example, so the volume for interpreters are better overall.