Gregory's ServerUpgrading a #ThinkPad T480 right now. Impressive laptop.
The one thing that I think is a bad design is the main storage drive bay. Wish they did would have just had a full length m.2 slot directly on the motherboard. The T480 design relies on specific cable and adapter board that will likely be difficult to obtain if you need the SATA version instead of the m.2 version or if the one you have malfunctions, is lost or broken.
It also seems to be picky about memory modules. I had to try quite a few before finding an acceptable combination of two 8GB memory modules.