Needed two new monitors for a new PC in the office. Went with this because it was the best value in terms of size vs price. I'd also purchased these for clients in the past and heard they were happy with them. After seeing the complaints about the colors being washed out, I gave my monitors away and decided if there were any problems with these I'd either live with it or fix it.
Out of the box the monitors were fine. The only complaint I can come up with is that the VESA mounts are lower on the back due to the slim design. After looking at settings, I determined that for me as an IT manager I didn't need to recalibrate the screens at all. Granted, I spend most of my time looking at text documents, configuration pages for network equipment, and the accounting software my company uses. I couldn't speak to color calibration for individuals doing video or photo production.
One thought on the others experiencing washed out colors - HDMI out on a computer kind of expects a TV. Televisions and Monitors will sometimes have different ranges for black levels, which can cause the screen to look washed out. If you're experiencing this, check the control panel for your graphics driver. You should be able to adjust black levels and fix the issue. This has been a driving factor in my preference for just about anything over HDMI. (Display Port is king, for what it's worth.)