I purchased one of these directly from Lenovo for my Thinkpad W530, hoping that it would make things easier. Unfortunately the opposite happened.
The power supply from the W530 will not plug into the power jack on the back of the port replicator because the W530's connector is keyed to only go in one way, and the port replicator won't accept it. I contacted Lenovo to purchase a power supply, but their sales team couldn't find the right part to sell me so they sent me to technical support. Four trouble tickets later I had received a 90W power supply that would plug in (but wouldn't charge the W530 as the W530 requires a 170W supply), a power cord with no power brick, a 170W power supply with the wrong size jack and many headaches; on the 4th call they informed me that the port replicator was no longer under warranty, despite being less than 2 weeks old. I ended up returning the port replicator to Lenovo as there was no hope of ever getting the right power supply for it.
The scary part is that Lenovo's website says that this port replicator is supported on the W530. They are wrong. If you have a W530 and want a port replicator make sure that it comes with its own power supply and that you can return it if there's a problem. Lenovo's support can't help if you have a problem.