I used Kailh Box Jade switches. It is VERY clicky. The Masonite plates and plastic side case don't echo much though, so it's not resonant or hollow; it mostly sounds like you're holding the switches themselves in your hand, with a fairly muted bottom out from these cheap-n-chunky XDA keycaps.
My favorite board to type on uses the equally loud Box Navies on an aluminum plate that serves as the entire top of a short "sandwich" case. I think it's fair to say I am not quite in line with the majority of mechanical keyboard enthusiasts.