The ASUS U31SD-A1 is an attractive 13-inch laptop with decent overall performance, good graphics power, and superb battery life. Overall, we prefer the Acer Aspire Timeline 3830TG, which offers even more graphics oomph and a faster Core i5 processor for the same price. The caveat with the Acer is that you have to give up about 2.5 hours of unplugged time. If you want all-day endurance along with the ability to game between classes or meetings, the U31SD-A1 is a fine choice.
It is a lightweight laptop that comes jam packed with a 2.1GHz Intel Core i3-2310M processor and a 1GB nVidia GeForce GT520M GPU. Measuring 12.9-inch x 9.1-inch x 1.12-inch and weighing 4.2 pounds, this laptop has a large island-style keyboard with generous spacing between the keys, a Synaptics touchpad that supports multitouch gestures such as pinch-to-zoom and two-finger rotation, two USB 2.0 ports, a 5-in-1 card reader, HDMI, VGA, and Ethernet. When you are just surfing the web, the notebook automatically switches to Intel’s integrated graphics, enabling the battery to provide up to 9-hour of operation time.
It is a lightweight laptop that comes jam packed with a 2.1GHz Intel Core i3-2310M processor and a 1GB nVidia GeForce GT520M GPU. Measuring 12.9-inch x 9.1-inch x 1.12-inch and weighing 4.2 pounds, this laptop has a large island-style keyboard with generous spacing between the keys, a Synaptics touchpad that supports multitouch gestures such as pinch-to-zoom and two-finger rotation, two USB 2.0 ports, a 5-in-1 card reader, HDMI, VGA, and Ethernet. When you are just surfing the web, the notebook automatically switches to Intel’s integrated graphics, enabling the battery to provide up to 9-hour of operation time.
According to a battery life test published by Notebook Review in their full review of the U31SD the laptop is capable of lasting through 11 hours and 5 minutes of web browsing with display brightness at 70% and Wi-Fi turned on. That is an awesome result and the U31SD is able to do that thanks to the 8-cell (5600mAh) lithium-ion battery. 
The ASUS U31SD-A1 received a final score of 3.5 out of 5 stars from Notebook Review. You can check out the full review here, included in the full review are benchmark scores and direct comparisons with other similar machines.
