I have tried them all and this for me is the best GSheets Ai integration tool.
Some of the reviews are criticising the set up process, but it is stated an API key is required, and obviously this is going to require some fiddling and time to set up, yes it isn't the world's most streamlined setup, but its an API integration into google sheets - what else are you expecting?
Once set up it works brilliantly, it can be a little frustrating not Saving As Values and therefore having to re-do work, but again, it is part and parcel of a tool like this that overlays onto google sheets.