I recently got the Precision 5500, which is great for the most part. The screen flicker is a trifle irritating, but I've had zero Linux compatibility problems. (I opted for Intel graphics.)
I just got one with the discrete graphics, and it works great with nvidia-prime. I only had to configure the touchpad a bit to avoid bumping it while I type. I upgraded from my beloved T420, and this is a great laptop.