i did a little project on the safe start and easy balance route in an african cichlid tank about 3 months ago, i added fish after 48 hours 24 for de chlorinator and 24 for safe start, and i havent had a death yet (touch wood) ive been using the easy balance weekly and nitrate hardly shows, do it can work. i do a water change about once a month now aswell because i get bored otherwise.
i think its a great product, for emergencies, or if youre on holiday anyone looking after youre fish can pour a bottle into the tank.