Been a big fan of Muscle Milk Powder for a couple of years. I usually mix with my oatmeal and fruit, but tastes great with just milk. It is dairy free, low in sugar, and cholesterol If you are in a jam, not bad with just water either. If just mixing with milk/water, a spoon will suffice, no need for a blender. Vanilla is my go to, but chocolate and banana are both great. MM not only tastes great, it is easy on the stomach.
I recall years of trying to stomach down Hot Stuff, not only a brutal to stomach down, took an industrial blender to mix, and went through me so quick I was never sure if I retained any benefits from it.
Personally I echo @johncox I would rather stick to meats and fish for protein also, but in terms of preparation time and convenience, MM works great for recovery/meal replacement for me, also for diet reasons, I know exactly how much (protein, fat, cals) I am putting into my body. @razorskier1 hit it on the head regarding the convenience in a time constrained world. Work, wife, kids, gym, bike, oh yeah I want to ski too.
I would love to hear what @SoCalWaterSki (or another triathlete) eats based on his crazy miles on the bike, feet, and water and then has strength/energy to ball.
@Than_Brogan whether or not it "works" is debatable, FDA won't even stamp any of the aforementioned products. What I interpret as "working" is that I am able to use the powder as a supplement to my diet and I have consistently gotten stronger and increased endurance, but only when I have put the time in at the gym.