This layout is called Colemak-DH, which is a slightly optimized variant of the original Colemak layout.

It was designed to make typing more efficient for your fingers than QWERTY. If you were to analyze the top ten thousand words or so in English, you’d start to notice lots of common bi-grams and tri-grams (two and three letter combinations). Colemak looks to optimize the position of the keys such that these n-grams are typed by “rolling” your fingers from one side of the keyboard to the other. In addition, it places a lot of other common letters in intelligent positions to reduce finger travel. Over longer periods of typing, your total finger travel across the keyboard is greatly reduced in comparison to QWERTY.

In theory, you can type faster on this layout, but in my experience that’s not necessarily true (I type the same speed on Colemak vs QWERTY). But it does feel so fucking good to type on. That alone should be reason enough to consider learning it.