Background
My name is Cosme, I'm 26 years old and this is my second Topre keyboard. My first topre keyboard was a Realforce 88UB and I liked it so much that I decided to invest in another Topre keyboard. I chose the HHKB because everyone talks about how great of a board it is. I had been wanting to try it for a long time and finally got the chance to buy it about a month ago.
Build Quality
The first impression is that the keyboard is quite underwhelming. It has no rubber feet in the back and the rubber feet on the front are really bad. Too small, bad grip. Of course this isn't a huge problem, but when you're paying so much for a board these little details hurt my "ego". I paid premium and expected a premium product.
Another factor about the HHKB2 is that it isn't plate mounted. You can't actually pop the switches like a PCB mounted mx board, but they aren't actually mounted into a metal frame. This raises some concerns regarding the durability of the product but the HHKB2 feels solid, no creaks or anything. Overall decent build.
It comes with a detachable cable, which I always love (Pexon here I go again).
Keycaps
As far as stock keycaps go these are probably the best yet. Medium thick PBT dyesubbed legends, pretty much all you can ask for. I originally had the blank keycaps, but I ended up swapping for the legend keycaps. I think this keyboard looks prettier with legends, really!
As this is a Topre keyboard you will find that the aftermarket for keycaps is extremely limited. There are barely any Topre sets available, specially if you are in EU

Layout
I have always been a ISO user and always loved ISO. That's why I got a Realforce 88UB first, I love ISO. It really is the most comfortable way of typing in Portuguese. Switching to this 60% ANSI-esque layout has been a serious challenge.
First major problem: the delete placement. Being used to the big enter key, I was banging the delete key pretty much all the time. ALL. THE. TIME. Eventually I got used to it, though it would take longer but after a day or two it was fine. If you actually think about it, it makes a lot of sense. I like it.
Second major problem: everything symbol is in a different place. I thought this would be a big deal but it was actually fine. Unlike other ANSI keyboards the "~" key (which is used in every other sentence in portuguese) is in a place that actually makes sense, typing in portuguese is no longer this oh-so-painful experience. It is still significantly worse than typing with an ISO layout, though. I really like the ANSI symbol placement for software development, it could hardly be beaten. The only thing that I truly dislike is that the parentheses are one key to the right where I'm used to, so I still make that mistake rather often. Didn't take too long to get used to the symbol placement.
Third major problem: caps lock was replaced by the Control key. This is fine and makes perfect sense: who the hell uses caps lock? No one, that's who. The control placement is a lot more ergonomic, but I constantly make this mental confusion with Control and Shift. Operations such as shift+select followed by Control+X confuse me, I have to actually think about what I'm doing. It's slowly improving, but after a month of usage I still make these basic mistakes.
Fourth major problem: lack of arrow cluster. I thought I didn't use the arrow cluster that much, but I used it all the time. It has been very painful to adjust to the HHKB's arrow function layer. Some people report that's actually more comfortable to use after you get used to it but I don't feel the same. I have grown used to it, but I don't love it. It's an inconvenience to use and not very ergonomic. I think I would prefer a FN+WASD combination, though I'm not sure about it because it would require two hands to operate.

Typing experience
I already had my first Topre experience with the Realforce 88UB (45g) so I knew what to expect about the typing experience.
It's hard to describe Topres for those who have never tried. I'd say they feel a bit like clears but the bump is less pronounced, softer, smoother, better. It's a great feeling that makes you wanna type forever (I admit, it is the reason I'm writting this short review heh).
The HHKB2 feeling is amazing. Absolutely fantastic. It has a lighter and smoother feeling than the 88UB. I'm gonna say it's due to the fact that the HHKB2 is plastic mounted (instead of plate mounted) but it's just a guess. The keystrokes feel softer, specially when you bottom out. It's quite addictive to type on the HHKB2, once you start you don't wanna stop. They feel perfect.
It's weird that I had so many problems adjusting to the layout but I still kinda like the 60% form factor. When I type in my TKL boards they feel too big. I'm no longer used for a keyboard to occupy so much space in my desk.
Sound
I like the sound of the HHKB2, if feels slightly more silent than the 88UB as well. I got the non-silent version of the HHKB2 but I feel like the keyboard isn't noisy at all. I wouldn't bother getting the Type-S version or doing silent mod. The keyboard is fine.
Gaming
I tried to play some games and it felt okay I guess. Dota2 and Starcraft were decent though I did miss the F1-F4 keys for a while. I tried playing Civilization 5 but since I'm super used to the arrow cluster for moving around the map the experience was very painful. Would rather game on my Filco Majestouch 2 with reds.
Veredict
It's very hard to rate this keyboard. My main problem with it is the layout. Every time I go back to typing on an ISO board I feel like it's way more comfortable, it feels right. I like the arrow cluster, even though I still have this ilusion that I never actually use it

On the other hand the keyboard feels fantastic. Way better than any other keyboard I own. Way better. It has changed me in a way: I remap every Caps lock to Control now, I no longer press the right key when choosing the autocompleted URL in chrome and I am more efficient and self conscious about the use of the arrow cluster. Positive changes!
I think this board isn't for everyone and that should be very clear. Before considering buying this keyboard you should stop looking at how pretty it is and start noticing how much you use your arrow cluster and imagine yourself living without it.
Overall I'd say that 60% is probably not my thing, but maybe a FC660C is. Gotta wait for them Zensuji. deals

Pros:
* Lighter Topre Switches
* Detachable cable
* Very light
* Best feeling ever
Cons:
* Sub-par rubber feet
* Layout is very hard to get into
* Very expensive, no EU retailer
* Doesn't stop me from typing crap