I use two shakes.
One is accelerade, which is like gatorade but with a small amount of protein added for cycling. I usually carry one bottle of water, and one bottle of the stuff when I cycle to supplement protein without having to eat solids since I ride long distance.
The other, met-rx chocolate whey protein with milk, peanutbutter, and bananas for after jiu jitsu when I don't want to consume solids again.
The shakes are meant to be supplements for right after workout (usually within the hour of workout) to help your body get to muscle fibre recovery mode to repair the torn muscle fibres. You have meals as regular and don't replace them with this.
Also, I wouldn't recommend using it daily, it does some small damage to the kidney over a long period of use.