I use the X-Rite Eye One Display 2 to callibrate mine.
Do you 100% need to. Probably not. But its nice to know that the colors you are seeing are the ones you are supposed to.
This however assumes that the image you are looking at has been produced on a callibrated monitor.
I would gues over 80% of images posted here are produced on non callibrated monitors so you have to ask if its worth it.
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