I've had a new 2018 15" MBP since late July 2018. So far, it has been working perfectly. However, about 4 months after picking it up, I started noticing a dark shadow developing in a long narrow region of the screen. The shadow didn't have well defined edges. It was about an inch or so high, about mid-way down from the top of the display, and about 6 inches or so wide on the left region (more left than right). I would characterize it as a dimming of the LED backlight. Over the holidays, I took it into the local retail store. A genius ran a few diagnostics. They declared the screen had to be replaced. They were able to replace the screen within a day (under warranty). I've been using it now for a few weeks, and the replacement screen has been perfect so far. Hopefully, there's no further drama with this very expensive laptop.