What's your opinion on 'Ajinomoto' (msg)?

Is it really as unhealthy as the scientists say, or is it just a harmless natural flavour enhancer?

Could you taste the difference in a meal that has Ajinomoto (Monosodium glutamate) added or not?
Update: Sarah, eeee, your hair used to fall out when you ate food with it added, that is terrible
Update 2: Thanks for all the replies, all are very good answers and I wish I could give ten points to all. It has certainly put me off using msg in my cooking.
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