I have this dock for my T420s and T430s computers. A definite must have if you want to expand the display across more than your laptop screen while at your desk. Has excellent expansion of USB with 8 USB2 connections and a USB3 connection. I have this setup for in concert with a desktop machine, with a KVM switch to swap between my gaming desktop computer and my work laptops. I have one at my desk in the office and one at my desk in my home office.This will not work for the T440s computers as the docking connection was switched on the newer machines, which was a major disappointment that Lenovo would render this dock inoperable for their newer machines.Notes on the display expansion---------------------------------------The following is not a reflection of the dock itself, but the interaction between the dock and computer. The ability or lack thereof is a reflection of the differences in Lenovo's setup in the computer and my opinion on how to best utilize your dock.T430s - In order to get three screen support (two external displays + internal display) you need to have the external monitors connected using the DisplayPort connections. If you use the DVI, the wiring internal to the laptop only allow two screens to function, either two externals or one external + one internal. The display port connections have to be DisplayPort to DisplayPort, no DisplayPort to DVI connections from what I can tell.T420s - Supports three screens regardless of how you connect your monitors, either DisplayPort or DVI.