The HHKB would not be as popular if case-mountedness was crap.
But this is personal opinion - you might hate it whereas others like it.
Especially if you are accustomed to 55g RealForce, you might find the HHKB too light and never get used to it.
I like my HHKB, although I don't take it anywhere, but it is usually my go-to keyboard when I need a quieter keyboard at home during the week.
My #1 Concern with the HHKB is the layout and getting used to it....You have quite a diverse collection. How hard is it for you to get accustomed to the HHKB switching between it and standard layout boards? When you first got it appox how long did it take for you to become comfortable with the layout in general?
Cheers!
I use ANSI layout keyboards almost everywhere except my HHKB.
I tried taking it in to work, but our editors and IDEs (and my many years of keyboard habits) rely far too heavily on function keys, dedicated arrow keys and other navigational keys.
My productivity plummetted.
So I brought it home and use it during the week so I don't wake anyone up (it is one of the quietest keyboards I have). I use it on my Mac, which uses Ctrl sequences for much navigation. Ctrl-A for beginning of line, Ctrl-E for end of line, Ctrl-D for delete character and so on. This is very easy to get used to, especially with the HHKB's Control key position.
Backspace I cope with rather well, and it's been a while since I typed \\\\ when I switched back to an ANSI layout keyboard. HHKB arrow keys are no problems for me now either.