Never used it but have used protein shake for breakfast and sometimes lunch for years, not every day but as and when I want it
I started due to wanting to lose weight but now it works as a protein smoothie adding fruit as a refreshing drink in the morning when I dont fancy cereal or porridge. Occasionally I'll have it for lunch to
It's a convenient way of getting some good nutrients in your body, can help with weight loss due to controlling calories and times of eating more etc.
If it works for you then do it, your not drinking huel to please others on the Internet forum but for your own needs. If people make money from selling it who cares, people making package sandwiches also make money!