Lenovo got us a pre-release patch to fix an issue with a network card's ROM and our WinPE 2.1 PXE booting. I was in direct contact with their engineer team. They did this for "free" (we bought a lot of X200/X201).
Our Dell desktops had the same nic, but their support pretty much told us "Use WinPE 3." and closed the ticket.
Now we buy Lenovos for our desktops as well. :)