This is my first hydration vest. I purchased this because the weather has seemed hotter and more humid than prior years and I couldn't hand carry enough water to last my entire run. I matched this with the 70oz bladder. I choose this vest because is was barebones and it looked light and airy.
I have only used it a couple of times. I'm 6'3" and about 220lbs. There is plenty of room for adjustment on the sides to accommodate layering or reduction in my girth ;). I do have the sternum straps to smallest limit so for smaller people these might be slack. Overall the vest fits well.
This zippered pocket holds my iPhone 8, which I like a lot better then my previous armband holder. The other pockets seem well sized and adequate for my use.