So I have a couple HHKB's both because of the layout and the size. I love them and wouldn't give them up (use one for travel and one at work). I figured that I should complete the topre experience and so I just got a 87U EK. I figured it would feel almost identical to the HHKB's (or maybe that is where I set my expectations). I am pleasantly surprised. The realforce feels better. Not trying to start any flame wars, but I was a lurker for a while looking for advice on new boards and figured I would share for those after me.
Honestly, I am still going to use both the HHKBs and the realforce and would still buy both. But I figured that having the realforce would be similar to the HHKB because of the switches, but something about the platemounting or something else does make the experience significantly different. I have read this from other users in one way or another, and am confirming.
(I should perhaps mention that I have a number of boards with reds, blues and browns as well, but I switched to the dark side after the first HHKB)