A friend of mine had tried this kind of "finger water", but don't know if the same brand as what you see. It worked for her girl aged over 1. But when bb eats this kind of "finger water" which is very very bad taste, they will vomit and find that kind of "water" too bad taste and hence don't want to eat finger again.
My elder daughter used BiteX when she was 2. After using it a few times, she cries even seeing the bottle.
However, after using it a few times when she is sleeping, she get used to the taste and suck her finger anyway even if it is bitter. So I would pull her finger out and stop her from sucking as early as possible.