I own the stock. I bought the the Prosecco Brut and wanted to like it. I didn't. It tasted thin and tinny to me. I tried it again. Same result. I'm not a wine connoisseur, but I have drank a lot of champagnes and sparkling wines over the years, and I simply didn't think it was very good.
I then tried the Zero Sugar. It was better than I expected, but perhaps that was because the Brut had set the bar rather low. Would I be a repeat customer at $23.99/bottle (the price I paid)? Nope, but if zero sugar is important to enough people, I think it could find a niche. I haven't tried the Rose.