Like all Razer products, in order to get the full function of the BlackWidow Chroma Razer Synapse needs to be used. This means longer boot times and an always online DRM.
Razer makes their own switches - Orange (similar to Cherry MX Brown) and Green (similar the Cherry MX Blue). They aren't held up to the same QA processes switches from other manufacturers 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.
The keyboard has a USB port as well as a headphone jack. This makes frequent plugging/unplugging of peripherals easier, expands the number of available ports, and can allow for better cable management.