When comparing KBT Race 2 vs Leopold FC660C, the Slant community recommends Leopold FC660C for most people. In the question“What are the best compact (≲ 75%) mechanical keyboards with dedicated arrow keys?” Leopold FC660C is ranked 1st while KBT Race 2 is ranked 2nd. The most important reason people chose Leopold FC660C is:
Topre switches are a high end switch which typically cost a hefty premium. They have mechanical components protected underneath a rubber dome which makes them more durable.
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Pros
Pro Fully programmable
You can create macros that are stored on the keyboard itself as well as set a complete second layer of bindings via a toggle.
Pro Topre switches at a good price
Topre switches are a high end switch which typically cost a hefty premium. They have mechanical components protected underneath a rubber dome which makes them more durable.
Pro Solid construction
The Leopold FC660C is a solid and well-build mechanical keyboard. In fact, it's heavier than the HHKB (Happy Hacking Keyboard).
Pro Topre switches are plate mounted
This board's keys don't feel bouncy thanks to it's topre switch design. Since the torpe switches are mounted directly on the plate, the board feels much stiffer overall.
Pro Compact and portable footprint
If you love your keyboard enough to want to use it everywhere, it should be portable, especially if it's as expensive as this one is. The FC660C is very compact and easy to carry around.
Cons
Con PCB mounted switches
Most of the high quality full sized mechanical keyboards have steel plate mounted switches to improve build quality and typing feel/sound. The switches on the Race 2 are mounted to the PCB, which improves modifiability, but has the tradeoff of reduced typing feel and sound.
Con Can suffer from squeeky "plastic on plastic" rubbing with the case
Con Very expensive
Con Non standard key sizes
Non standard key sizes means your aftermarket keycap options are limited to non-modifiers. This issue also exists with virtually every other keyboard that utilises the Topre switch.