I tried it last year. If you taste it straight, it really does taste exactly like sugar (IMO). I mixed it in a beverage and it was still just like sugar. I then used it to bake brownies and that's where the difference began to show. As a test, I used a simple brownie recipe from Cooking Light and baked one batch with all sugar and the other with half sugar and half zSweet per their suggestion. While the brownies made with zSweet were still very sweet to taste, they were very fluffy and cake-like. I took pictures of them side by side, I need to find them
Overall, I think the product is too expensive to use as a regular replacement, especially when it seems slightly limited. Personally, I'd rather buy real, organic sugar when I have to have it, and then curb my sweet tooth instead