Definitely worth it!
We have a cattle dog cross in suburbia so he's been labelled a "nuisance barker" by a number of neighbours. Decided to try a proper static zap collar as the citronella bark collar didnt work on him. Within 48 hours he stopped even trying to bark! Even at the postie which is unheard of! I highly recommend this collar and have in fact recommended it to a few neighbours with some nuisance barkers too. Fingers crossed for a quiet street now!