When it comes to expressing positive sentiment, "is good" is a phrase that can be used frequently, but may become repetitive or seem lackluster over time. There are several synonyms that can be used to add variety and nuance to the expression of something positive. One option is to use "is great," which conveys a heightened level of positivity and enthusiasm. Other synonyms include "is excellent," "is wonderful," and "is amazing." Each of these phrases expresses a stronger positive sentiment than "is good," and can be used interchangeably depending on the context and desired tone.