I cannot type comfortably on anything but MX black or browns, so I wasn't able to use an ergonomic keyboard yet. There's one company in Australia that builds to order ergonomic keyboard with mx keys, but the price is in the same range as HHKB, which makes it hard to order blindly from across the world, and custom built on top, which means hard to send back for quality deficiencies.

Are there other ergonomic keyboards with mx switches?

I'm using a tenkeyless mx black at the moment where I had to insert multiple layers of padding to dampen the echo sound of the pcb on each key press.