
It has one obvious flaw which is pitched as its benefit - the rubber insulated body. Most of us use the temperature of the pitcher sides to tell when the milk is hot enough, rather than using a thermometer. You can't do that. You can only touch the bottom which gets hot faster than the sides.
If this was the only flaw you could make adjustments. However, the fatal flaw is the spout and the fact that it actually sticks up above the edge of the pitcher. Depending on how fast you pour milk, it either spills over the side edges of the spout or it spins as it exits the spout. The spinning motion ruins any attempts to create latte art.