I have a Filco Majestouch with browns at work, and one with blues at home. I mostly prefer the blues, but they are obscenely loud so just aren't that practical for an office environment. The browns are not much louder than a normal keyboard unless you are really pounding away on them.

If you are already using a Kinesis, you won't get much out of a Majestouch - They're as straight as an arrow.