Don't know how I lived without them.
I got two pairs; the Havok with Crystalline (10%), and the Vinyl with Amber (65%).
When I bought these I was beginning what would become an almost 8-month code crunch, where I was in front of my monitors for 8-12+ hours a day, including weekends. I had begun getting serious eye strain, mental fatigue, and then began the headaches, and ambient room lighting and f.lux were not enough.
I truly wasn't expecting the results I got.
I put the Crystalline pair during the first day thinking it was probably "good for me" but I wouldn't notice anything, but my eyes immediately acclimated and the almost-subconscious "stress" of looking at any backlit device was lifted.
I opted for the 10% because I still need color-clarity a lot of the time. There's a very slight rose-colored tint, but it didn't impede my work, and moving my glasses down is quicker and easier than any technical solution I was using. I also found myself stoked on the slight magnification, as the increased clarity makes for easier reading and doing pixel-level detail work without necessarily needing to zoom.
When I started using the Ambers at night, I could *feel* my eyes rejoicing — I'm not even sure how to describe it. The strain, fatigue, and headaches stopped immediately, and I was adding hours back to my days that I was losing to the sheer inability to look at what I was doing. Having spent ~30 years in front of screens, I can't imagine the undue burden I've been placing on my eyes and the damage inflicted.
A year later, I continue to use them every day, often interchangeably depending on time and task. They're an essential tool in my kit now, and I find myself trying to find excuses to buy other styles.
Both models are comfortable (once you spend some time breaking them in) and look good on my face. My only complaint is that the thicker frames are really uncomfortable if you're wearing headphones.
Would recommend to a friend.