Never heard of TCL til I saw them at Costco. Suppose to be pretty good for the cheap price. I read reviews on amazon.
Last night I picked up the new 6 Series TCL. 55" and has all the bells and whistles you could want in a 4K TV.
Got an XB1X also.
Out of the box I found the colors to be amazing. I tested out the Black Panther 4K blu ray and found the scenes to be too dark.
I originally was messing with the settings via the phone app. After a couple googles I saw that via the TV remote their is a separate menu with more settings.
Towards the end of the night I had the TV looking much better. (I've had this experience with every TV I've had from all different brands: Samsung, LG, Vizio, Sharp, and now this TCL).
Done to what really matters: The TV looks great, and like every other review you'll find online will tell you, for $600 you aren't going to find a better TV either in image quality or features.
In "game mode" the input delay is imperceptible and the image quality stays great.
I still have to adjust the settings a bit more but so far I can say the reviews were spot on. This is a great TV and definitely holds it's own against the big brand names.
Just keep in mind that this is NOT the best TV available. It's just the best TV available in its price range and gives TVs $500 more expensive a run for their money.