I am sorry to see people up in arms about some discussion on a TV.
As I said before, this is the best consumer PQ money can buy.
They have an unbeatable contrast ratio.
They are also the most expensive 55" on the planet. Its difficult to argue 'high value', which is what i said a low PQ/$ ratio. I don't recommend car buyers look for high value in Lamborghini either.
They have a low peak brightness for HDR content, an issue in a well lit room.
All OLED suffer from flutter and wow in their drive mechanism, they have a current controlled output which is typically less desirable in an electronic device due to increased power consumption, ease of implementation, and accelerated decay mechanisms, etc.
http://www.osram-oled.com/oled/en/news-and-knowledge/application-notes/driving-of-oleds/index.jsp
http://www.tytlabs.com/english/review/rev382epdf/e382_055ishii.pdf
Image retention is such an issue that most sets have auto-dimmers some that cannot be disabled, even for calibration. Spectral has developed special workflows that defeat the mechanism by introducing a full field window at a specified timing interval to avoid the dimming. I used burn-in and image retention interchangeably, because it is the same mechanism, but I stopped using the term burn-in b/c many are associating it with the permanent display destroying image retention of yesteryear and this is not a characteristic of these sets.
Due to the decay mechanism, wow and flutter seen in the output luminance at a static EOTF level, etc, it is easy to see how a calibration does not in fact hold up over time, and people concerned with keeping a calibrated set should expect a higher frequency of calibration.
So I am not trying to deter anyone from purchasing OLED, but consumers should be aware of potential issues when considering this display technology.
On a somewhat related note, to those a bit savvy and interested in calibrating HDR10 on their 2016 LG OLED with their colorimeters:
http://www.lg.com/us/support/products/documents/UHDA Calibration Procedure.pdf
They have done some great work in software access to calibrate HDR with some of these features. This is literally impossible to do on my X800D, as it retains almost all settings between SDR and HDR mode.