This keyboard is also available with the numberpad ($100).
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Pro Ports on the keyboard
The keyboard has a USB port as well as a headphone jack. This makes plugging/unplugging frequent peripherals easier, expands the number of ports you have available, and can allow for better cable management.
Con Razer switches
Razer makes their own switches - orange (similar to Cherry MX brown) and green (similar the Cherry MX blue). They aren't help up to the same quality assurance other switch types are, and there are many claims that switches aren't uniform (pressure and actuation distance is different between keys). They are a bit worse for typing - the actuation distance is a hair shallower - although this is preferred for gamers.