It was a novelty, but for the price it was a very good novelty.
It had problems though. I found that the device tended to get confused about my original facing. So straight ahead would eventually mean turning my head. I'd have to shift around to avoid straining my neck, but it didn't really help because straight ahead would just continue shifting after a little while.
I don't use it much, but it was definitely the coolest thing I got.
Magnetometers are typically 3-axis.
Not worrying about fuel, oil, etc is great and turns trimming from a proper "job" to "Ill just do a bit of trimming while waiting for dinner". It has been one of the biggest and best improvements to our daily farm chores in years.
I spent countless hours reading all the articles bashing Apple for it, and finally concluded that much of it boiled down to the fact that it was an expensive machine for the specs it delivered. And that is undeniably true.
But I stare at the darn thing virtually all hours I am working and a significant chunk of my leisure time as well. The reality is that for my actual computing, things like weight, battery life, how the keys feel, the screen, etc., matter far more in my enjoyment and utility of the computer, and on that measure Apple continues to knock it out of the park. I got my first MBP because of the retina screen, and soon thereafter realized I could never go back to using a device with a lower pixel density. I kinda feel the same with this machine when it comes to color: It is just stunning. Given how often I am looking at it, that dimension alone made this purchase worth it IMO.
The Touchbar has in fact mostly been a gimmick, although pairing it with BetterTouchTool has actually been extremely powerful and I've come to use it more and more.
Call me a vr believer now
If you're interested in developing for Vive, there's https://aframe.io