Not OLED-specific, but I just spent over an hour wandering back and forth at the local big box store trying to pick a new TV to replace my embarassingly ancient CRT.
So the current top recommendations for 55" flatscreens are LG's OLED B6P, and Samsung's KS8000. Both fine-looking sets at first glance, but...
The LG OLED-- beautiful picture, but has a thing called Automatic Brightness Limiting (ABL), which means the brighter the entire image, the darker it gets. On nearly all-white scenes in the store demo the display basically went grey. It's not a subtle effect. As someone who watches a lot of animation, this would drive me insane. There's little solid information out there on why this exists. Cheaper power supplies? Screen life? Regulations? Nobody knows.
The Samsung LCD looked very good, and had brighter brights than the LG, but had noticeable backlight uniformity issues. Every one had significant shadowing in the upper left and right corners. I suppose this is an improvement over the Samsungs I looked at this time last year, that instead had flashlighting issues in the corners. Again, this would drive me insane, and both issues are due to the shitty edge lighting that sets use today because it's cheap and thin. Whatever happened to full-array backlights?
Oh yeah, of all the TV manufacturers, only Vizio... smegging Vizio... offers a range of full-array backlight sets. Their 2016 P-Series apparently delivers a fantastic, uniform picture with deep blacks. But it also apparently has crappy upscaling of SD content, and you have to control the TV with an Android app. Seriously. So you get to worry about your remote going dead daily instead of annually.
Wait, Samsung does offer ONE full-array backlight set, but it's a 65-incher... and it's curved. Sigh.
TV technology today is simultaneously amazing and ass.