If you've ever worked in a professional environment for an extended period of time, chances are you've used an IBM-come-Lenovo ThinkPad at some point. Their simple black rectangle designs with the little red dot on the keyboard are downright iconic...

To that end, the latest notebook in the T-series, the Lenovo ThinkPad T440s, is one of the company's slimmest and lightest to date (save for the X1 Carbon series). It weighs in at 3.5lbs (without the extra battery) and is under 0.8 inches at its thickest point.

So is the ThinkPad T440s the same old business laptop with a slimmer profile and a couple of chassis tweaks, or is it a true evolution of the T-series?