I own, or have owned, the following Topre-switch keyboards:
HHKB Pro 2 45
HHKB Pro 2 45 Type-S
HHKB Pro 2 modded to 55
Leopold FC660C 45
Novatouch 45
RF 87U 45
RF87U 55
When I first modded my HHKB to 55g, I really liked the pronounced tactility. However, after a while, I found that I preferred the stock 45g weight. The same with the RF, although the preference was less clear with the plate-mounted switches.
In all cases, I prefer my Topre switches to be lubed and silenced.
I liked the feel of the FC660C, but I didn't like the layout or the caps that were available at the time, so I sold it.
My current daily driver is a HHKB Pro 2 45 lubed and silenced. I have the black (dark gray) model with blank black mods and spacebar, blue alphas, and red Esc and Fn. I love the 60% form factor, HHKB layout, sound, feel, and appearance of this board.