I have 2 KA2's, one for my personal and work rigs, respectively. I've honestly never had a problem with their noise level, they sound pretty much the same as any other modern and commonly available mechanical keyboard.

For shits-n-gigs I bought a Dactyl Ergodox from Oh My Keycaps, I'm still waiting on it to be delivered but I'm really stoked. I would never go back to a typical keyboard.