These are an expensive way to give your cat some fiber. At more than $1/0.5oz (at the time I'm writing this), these are significantly higher in price than the major name-brand Churu lickable treats, which also have ingredients classified as prebiotics like tapioca starch and guar gum (and which also are free of artificial colors or preservatives). The name brand doesn't seem to have any recipes with inulin, but some do have fructooligosaccharides, which can serve a similar function. You could always mix your own inulin or another fiber source like pumpkin puree or psyllium fiber into the cheaper name-brand treats for a similar effect.
That being said, if you're trying to avoid natural flavors or have some other reason to object to the major name brand option and the price of these doesn't bother you, these are a fine option. The consistency is good: thick enough to not be runny and drippy out of the tube but not so thick that it's difficult for the cat to enjoy. The flavor seems to be good: my cat who is normally picky about having the same flavors multiple times in a row has happily eaten these pretty much daily for about a week. You do only get the one flavor from this brand, though, so you won't be able to provide a variety if your cat is even pickier about that than mine. These have perhaps helped contribute to an improvement in the consistency of his stool, and at the very least they haven't wrecked him.