I bought 6 of the Cherry/GMK, one of the SA, and one of the OEM profile caps, a combination of anodized and non-anodized. They are all built to a very high standard of finish, weigh almost exactly as specified (within 0.2 grams), and have the most amazing texture. I feel like part of the reason these aren't as popular is the lack of typical artisan features like embossed characters or icons, enameled inlays, or textured surface relief (e.g. ripples) that are common on metal artisan caps from Rama Works. At $45, these are priced below Rama Works' and no one else is making titanium keycaps with this level of quality.
Definitely looking forward to the pin-tumbled and mirror polished options, and I need XDA profile to complete a set arriving later this year.
One nit on the profile dimension diagram for DSA profile. It says "OEM, they are all the same" in the middle, when it should say "DSA, they are all the same." Of course, OEM keys have varying profiles depending on keyboard row.