Could MSG be harmful?

Upon paying at the counter of a Chinese restaurant in California, I wondered why the restaurant states “NO MSG, used in dishes.” So far this is what I know about Monosodium glutamate (MSG), it looks like clear crystals similar to salt and sugar, it is a sodium salt of the amino acid glutamic acid and a form of glutamate. MSG is used in most Asian dishes to enhance the flavors of foods and is usually under brand names such as Accent. Could it possibly be hazardous if consumed in large amounts? According to one study- “It has been demonstrated that high concentrations of monosodium glutamate in the central nervous system induce neuronal necrosis and damage in retina and circumventricular organs.” So limit your intake of foods that contain MSG.

http://www.cfsan.fda.gov/~lrd/msg.html
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=16488110&dopt=Abstract