So far this vest is awesome. It fits true to the size and measurements listed on the website. I'm 5'4 and 130lbs and the small is perfect. Battery lasts me all day long (9 hours) at work on low. I've only used the low setting, but anticipate using the warmer as winter goes on. This vest is great as I work in a warehouse with no heat, outside through out the day and into a heated office. Its nice to turn the vest on or off or up and down rather than lots of layers on and off.