I went and sat in a bunch of high end office chairs including the Herman Miller Aeron, Herman Miller Embody, and Steelcase Gesture. I feel like the HM chairs are a lot more "opinionated" about how you sit, and sitting wrong will be punished with pain (e.g. back of the legs for folding your legs under the chair). I have heard that shorter people find them more comfortable though (6'1" here).
The Steelcase Gesture is a good chair too, but the arms on the Leap are leaps and bounds better (fixed Vs. semi-lock on the Gesture). I just feel like for computer/mouse users, having fixed arms makes a lot more sense than infinitely moveable ones that don't lock as well.
It was absolutely the right decision to spend almost $1K on a chair. I've already owned it longer than any other chair and it remains comfortable after a few initial weeks of tweaking.