I've just switched back the HHKB Pro 2 to write this reply, I am finding the 55 grams rather heavy on my dainty fingers. Its all just a matter of getting use to something new. The RF definitely feels more solid but sometimes this isn't always a positive. It is almost as if getting a new Topre board has made me realise just how good the HHKB Pro 2 is. It wasn't love at first sight though. I hated it for months and tried several times to part with it, but when it received interest, I had a change of heart - read weakness. It took months of trialling to finally fall for the little beast. For me, I think the fact its customised for the Mac and has keys to reflect this is a winner. The size is wonderful, I think this will be my new travel board, but that means getting a case for it. More money and more stuff to house. My previous travel board was the Poker II with browns, but since the additional of a metal case, I think that is more just a novelty item now. Its weight does put me off a little.
It isn't just one thing about the HHKB that wins for me however one thing I can say, I try to replicate the HHKB layout on all my other boards, so far as possible. This I think speaks volumes.
When I was starting out, I made the mistake of buying two ISO units. Its not a big deal, I am in the UK after all, but the HHKB hit my sweet spot, and I find ISO annoying and its not possible to get the backslash to delete, because it does not exist on the ISO. Ideally I'd like to swap these for ANSI variants but having just parted with a bucket full of cash in the past month alone, I am just trying to avoid any more expenses of this nature.
Here is my board of choice, with its new key caps.

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Hypersphere wrote: ShivaYash wrote: Bump alert... I have the same disease Hypersphere speak of, and can't stop reading keyboard reviews. I type this on my new 87u with 55 gram switches. Its great, I really really love it, but I think my quest for the perfect board sadly ended some time ago. The HHKB Pro 2 really just works, especially on the Mac. It feels nicer than the RF I have in front of me right now. Its smaller too. But as others have said, its just a matter of getting use to things. I will persevere with this new investment of mine for some time to come, before giving the final verdict. And I have a SSK en route. Its a tough life.
When Trev started this and another thread on his quest for the perfect keyboard, he thought he had found it in the HHKB Pro 2, but he ultimately went back to the RF 87u variable and as far as I know settled on the larger keyboard.
As for me, I continue to go back and forth. I much prefer the 60% form factor, layout, and attendant symmetry of the HHKB Pro 2, but I also like the more solid sound and feel of the RF 87u and the heavier switches in the RF 87u 55g.
What is it about the feel of the HHKB that you prefer to the RF? Sometimes I prefer the HHKB feel as well -- it seems sprightlier than the RF, and perhaps owing to its case-mounted switches, it seems to cushion my keystrokes, whereas the RF with its plate-mounted switches feels unyielding.