Très bien is "very good". "Trop bien" sounds like it's too much!
It could be in positive or negative way, upon the context
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It's like: very good and too good
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Merci..!
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But in French, we often say: "c'est trop bien" to insist and say that it is really awesome ! For example, "j'ai adoré ce film, c'était trop bien!"
Hope it helps :)