Had some image retention issues with m 2713H so I had some back and forth with Dell. Ended up with 3 panels, all with the same issues. First got a refurbished one, which was perfectly fine except it had the exact same issues as the first one. They then decided they would swap the refurb for a brand new one and see if I still had the same issue. Got the new monitor, same issue, at which point they basically said it's working as intended.
Never came around to pick up the refurb tho, so I decided to keep that one and sell the new one for the same I gave for the monitor in the first place. Pretty good deal imo