I have no idea, I'll check them out. The problem is that I am not sure how noisy these are, I'm sure the feedback is good enough. Btw, I don't care if a keyboard is fully mechanical as long as it has a nice feel to it. Leopold looks nice too.
They're pretty quiet on their own, but also have further silenced variants (often called type-s or some such). Also look for Topre Realforce or HHKB Pro 2. The latter is what I generally recommend to folks that want to get a good board without having to wait around for the typical group buy periods. The small form factor takes getting used to, but I love it. There's a newer model called HHKB Pro Hybrid that has both wired and bluetooth, but iirc it's a bit hard to find right now.