It's Great! I really like the taste/texture of and find it convenient, cheap and healthy. I love the website as well! I've recommended it to several friends.
There are a few things that I would like, if possible. I'm following a diet with higher protein and fat and lower carbohydrates. I think this is true for many weightlifters. The Active formula is great for getting protein, however it actually has more carbs (per bag) and less fat. If possible, I think your market for Active would be better served with more fat and fewer carbs in the recipe.
A second thing is that I found that it's difficult to change your flavours with a subscription. I would like to be able to change my flavours month-to-month more easily.