I have the Aonijie one. It's... fine. I have it hanging in a closet somewhere. I think it's a little too warm for me in the summer. I haven't had a chance to try it in the fall. I tend to have nipple issues too, so a vest adding wear and tear to my useless man-milkers doesn't help.

My go-to for hydration, after trying about 10 different things, is still a Teton Hydration Pack. It's light, inexpensive, has a large pocket for phone/keys/gels, and a bunch of handy tie down spots.