I've been trying out a G80 with clears for a couple of weeks. I like the feel and sound of them if I bottom out, but I don't like the amount of work that takes due to the stiff springs. If I use a lighter touch, and don't bottom out, I don't like the bouncy feel. I'm still getting accustomed to them, though, and I'm just now getting to the point of being able to easily sense the tactile point while typing.
I'm using the board at work, and I would say the clears are not very loud at all. They're slightly louder than rubber domes, if you hammer away at them like I do. They're much quieter than buckling springs. They also feel stiffer than BS to me.