IDOMINO7-
Good morning! I thought I'd chime in since my brother and I both have one of these. They are actually very nice, and they can get you warm quickly, trust me!! I have a mix of tools, so batteries are not a problem for me (12v MAX and M12), but that being said, this jacket is a must have. Now with 2 different color schemes (cammo and red) it makes it even nicer to have- I have started to see these at football games, some of our friends have them, and I have seen them being worn by numerous people on Facebook as well.
The batteries do last quite a while, but all the same, I would pick up 1 extra as the 3 heat settings draw at different rates. Red light is hottest, white is medium and blue is the lowest. Very comfortable jacket- make sure you order true to your size as you will want the jacket to be close to your body for the heating elements to work best.
ENJOY!!