I use Scitech products. They taste amazing, even when mixed with water, although admittedly much better with milk.
The only two things to be wary of are protein and carb content. Some have a rather low protein count with a high carb count. When you compare products, you'll learn to discern the good from the bad. Obviously, low-carb and high protein, is ideal.
The one I use is 22g protein, and 4g carb. Don't forget, too, that milk has quite some carbs in it (8oz of low-fat milk has 11g carbs!). I don't use pre-mixed products.
They totally work with my lifestyle, and totally erase my evening sweet tooth, but I wouldn't think they work for everyone.