One of my friends sent his EyeOne Display 2 back to Switzerland for factory recalibration/recertification. (It costs around the price of a new EyeOne but I agree with him: A fresh recalibration/certification sounds much better than buying an unknown thing in a box....) They offered him a new measurement head with a new firmware which is able to handle WCG and LED displays. It was expensive but yes, it is really WCG and LED compatible now. (I chose to buy ColorMunki, so we could compare our results ans we can "borrow" our instruments from each other if necessary...) But X-rite or Datacolor won't note it on the box if it is WCG compatible or not. And I think they don't sell them in retail shops these times. But a ColorMunki or an EyeOne Pro just works. And the ColorMunki is not so expensive (if we correlate it to the expensive colorimeters, because those are cheaper hardwares for relatively big prices...). And yes, may be it looks correct for you. It's your choice... until you want to write a review about a display... May be you will publish erroneous measures and you will judge the test specimen based on your erroneous measures. So, I feel it is very dangerous! (If you care about the quality of your reviews and your integrity, I would suggest you to check your results with a spectrophotometer before you would publish that review. Or at least make a note about this possible issue.)