When comparing Leopold FC660C vs WASD V2, the Slant community recommends Leopold FC660C for most people. In the question“What are the best keyboards for programming?” Leopold FC660C is ranked 9th while WASD V2 is ranked 31st. 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 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.

Pro Great customization options
This keyboard is greatly customizable. Things like layout, keycaps, home button or switches, can all be modified.
Pro DIP switch configurable
It has DIP switches that can be used to implement settings like changing the layout to Colemak or Dvorak, swapping the function keys to be like on a Mac or disabling the menu functions.
Pro Solid build quality
This thing is built like a brick. You can use it for years without any issue.
Pro Physical layout can be set to Colemak
For those of who type all the time on Colemak, it is nice to have keycaps that match. It is especially nice for those just trying to switch.
Cons
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.
Con No backlighting.
