I've got two T480s (a personal one and a work issued one). I've been really happy with linux on these machines. My previous machine was an XPS 13. The XPS had nicer specs but I've been happier with the T480s. Specifically, the T480s has a better keyboard, no coil whine and more expansion options.
It seems like the T480s is more similar to the Latitude line than the XPS line.