I have a Dell U3415W. I would say that mine is far from perfect.
- It has very bad backlight bleed, about as bad as maplingstorie's was.
- It does not show the Apple logo boot screen.
- It wakes from sleep in Windows, but not OS X; on OS X I have to power cycle the monitor.
- If I use the "Dell Display Manager" software in Windows (the split screen software), the monitor frequently goes black for 2-3 seconds and when it comes back up, all of my application windows have been re-sized to a very small size (640x480 maybe, not sure) and moved to the upper left corner.
- Two of the USB 3.0 ports are not meant for wireless USB devices. I had problems using those with my USB dongles for my wireless keyboard and headset. I had assumed that either the ports were dead or there was terrible interference from the monitor. However I found out this is expected behavior, as the manual states you should not to use those ports for wireless devices. I have never heard of USB ports not meant for wireless devices, but there ya go--it's right in the manual.
I guess everyone will have different opinions on what is acceptable, but I find this to be ridiculous and distracting:
Image
This is not my picture, but mine is almost exactly this bad.