I registered just to reply to this thread. I've been a mac user for 5 years now and just got a Das keyboard (Professional S model)... man this thing is still loud for being the "silent" variety. I can only imagine how ridiculous the other one is.
I was playing with my Realforce earlier – it makes my Cherry brown FILCO sound decidedly clicky. The description of "silent" for Cherry browns is an interesting notion (especially since it doesn't have any actual dampening, for example to cut out the sound of the switch returning to its up position, which Topre damp out in their silent Realforce models). And yes, Cherry blue switches are quite loud

You'll have to get one of each for comparison like I did with my two FILCOs, and I've kept both (technically; I gave away the brown and promptly bought myself another)