I had the Surface Pro 64GB for a few days now. I am very happy with the battery life. I've been getting just under 6 hours which is great for such a powerful computer. I work at home a lot and I have been able to kick-back in my family room on my comfy leather sofa. I love the pen too. It is so useful for pointing at smaller icons on the screen. I had many ultrabooks and laptops and nothing come close to the usability of the Surface Pro. This will go anywhere with me. I just wish there was a 4G option.