I use them purely for convenience, and have always gone with the maxi-muscle range as the chocolate is the least foul tasting in a water mix. Not the cleanest protein on the planet … but its not the most expensive either … and I’ve never had “wind issues” on it.
Mornings, makes a nice addition to a blend (frozen fruit, muesli, yogurt, half a banana, spoon of peanut butter and milk) in which case Vanilla is the least offensive.
The gym has recently installed a vending machine with a range of supplement drinks, and hence have actually started grabbing one of them post instead, less hassle.
I partake as I have always struggled to get weight on, hard gainer personified so its a calorie boost more than anything else.