I have a vest that is great. it's warm on it's own and very cozy when it's on. if youre only using it when youre chilly the battery can last all day, but it really depends on your temp setting. I like the size and placement of the pockets. In the next design iteration, it would be nice to have a haptic indication for what mode youre on. or move the light to the bottom of the vest or the inside of the collar. As it is now, the light is hard for the person wearing it to see and way too obvious for everyone else. You draw a lot of (unwanted, in my case) attention when the vest is on.