This is the Samsung RT21M6213SR. It's one of the first top-freezer fridges that Samsung has ever sold in the US, and you can get it for less than a thousand bucks. Click through to see everything that is has to offer.
This heat map shows the refrigerator's performance at its default setting. Compare it with the FlexZone heat map (previous slide), and you'll see that the temperatures in the fridge compartment are more or less unchanged. That's strong evidence that Twin Cooling works as promised.
Still, it's not a perfect result. You can forgive the hot spots in the butter bin and the bottom of the door, but those crisper bins really ought to be below 40 degrees F.
Finally, here's how the fridge runs at its coldest setting. No more hot spots, except for the butter bin, which is supposed to be a little warmer than the rest of the fridge to keep your butter soft. And look at the freezer -- the numbers are virtually identical to the previous test, where the fridge wasn't running so cold. Again, Twin Cooling seems legit.