My only complaint is that the flavors are very weak, most of the time i cant distinguished which flavor I'm drinking unless it is banana or vanilla since the both have a much stronger flavor/smell than the rest but i tend to just add honey and a bit of fruits and blending it all, overall the taste is surprisingly good (had bad experience with some other products).
I had a taste test at work and everyone was pleasantly surprised with the nice nutty flavor but overall everyone agreed that the advertised flavor is very weak.
I tend to find that blending it is much better than the shaker since it give a much more consistent texture, In the shaker i keep getting small lumps and the feel that i need to chew but that's a minor issue since i already tend to add fruits that need blending anyway.
It would be nice if you had a bland version without flavor or minimal flavoring and maybe add a bit more flavor to all the other varieties, but even if it stays the same i will be ordering more :)