I have been using Zenith since 2 years now and for me there is no step back from it: great product, easy to use, as simple as an SO2 addition! We have approx 60 different batches of whites and roses each year to bottle, and none of them failed a coldstab trial using Zenith. I have also run some trials on filterability test to see if Zenith would impact the Filterability Index, and it did not. There is also no temperature condition for using Zenith which is great when you work in winter in Central Otago! It just makes my winemaker life easier on pre-bottling times.