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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 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 Solid construction
Heavier than the HHKB (happy hacking keyboard).
Pro Topre switches are plate mounted
Topre switches aren't stand-alone switches, as in they are mounted to the plate. This means that the overall board is much stiffer (less flex) and less likely to have a key that feels bouncy.
Con Non standard key sizes
Non standard key sizes means your aftermarket keycap options are limited to non-modifiers.
This issue also appears with virtually every other keyboard that utilises the Topre switch.