Dislike.

No comments means that one cannot use it for configuration. Properties repeat the XML mistake of the attribute/content dichotomy.

And trailing commas as a syntax error prevents easy sorting/appending/editing of arrays.

And it doesn't fix a ton of JSON problems like strings containing newlines, quotes and the like, while introducing a ton of new problems, like the dependency on obscure Unicode features to elide quotes. This will lead to TSON homoglyph attacks.