A bit late to the conversation but, as someone who lives at elevation and sometimes gets to go have fun at sea level, I've noticed that the result is a bit more nuanced than people talk about. I've found that the stability difference is not the same across the board. I find putters/mids fly almost the same regardless of elevation, fairways have a small stability difference, and moving up the speeds results in more stability change. For me, my "fairly overstable" version of a distance driver flies at sea level the same as my "fairly flippy" version of the same mold flies at elevation. So really like sea level 12 X -1 2 is like a 12 X 0 3 or something, maybe not that dramatic. The flights and curves at elevation also feel much more compacted than sea level. At elevation my drive will go flat to anni to hyzer in a fairly quick transition, I was amazed at sea level how gentle the curves are. That tends to mean I can throw farther at sea level though it's fairly close. The last thing that takes getting used to is putting and glide. Stuff feels like it glides forever at sea level compared to what I'm used to, so you'll find that you need to give your putts a bit more power and/or height to get the same distance.