My wife and I have been having Queal for breakfast about 3x per week, so, not heavy users.
The vanilla was quite good (like cake batter), and the chocolate and peanut-chocolate too. The strawberry one we didn't care for as much -- the strawberry flavor wasn't as powerful as we would have liked. We haven't tried the other ones yet.
We found that a full 1/3rd of a pack was rather too much for breakfast, so we're having 1/5th of a pack each instead.