Hi there, no experience of that particular formula, but the soy in uk stinks too, and makes the poo even stinkier! It usually takes around 1-3 weeks to see a 100% difference.
Also, is your lo milk intolerant. Is that why there is a change of formula? If so, just a little word of warning that quite a few milk intolerant babies are ALSO soy intolerant. So if there is no improvement full stop after a week I would ask for a hypo allergenic one xx