Yes, "c'est très bon" is perfectly OK but it is a more general statement. "Il est très bon" refers to a specific subject.
Have you read this lesson yet? https://progress.lawlessfrench.com/revision/grammar/when-to-use-cest-or-il-est-elle-est-to-say-it-is
-- Chris (not a native speaker).
Could you give some context to your query as 'il est très bon' is often used incorrectly for 'c'est très bon'?
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