I have their RK12 here right now. I was told it's the 'same thing' as the Microphone Parts capsule, same factory. Haven't installed it yet, but it's half the price.
They are moving to the "version 2" capsules with slightly higher price points, I don't have any of those here yet. I was considering the V2 RK12 and the V2 K47 for $99.
Also curious about the K87 / U87. We'll see how the other ones go first, I guess.
I'm planning a big 'budget capsule' exploration but my DIY seems to move so slowly. Another K67 I'm really interested in is the JLI TSC-2, and that one's only $50! Might be too good to be true, but I need to find out. If I have to pay $99-$150 for consistency, whatever, not a big deal.