When comparing Razer BlackWidow vs Let's Split, the Slant community recommends Razer BlackWidow for most people. In the question“What are the best mechanical keyboards?” Razer BlackWidow is ranked 15th while Let's Split is ranked 23rd. The most important reason people chose Razer BlackWidow is:
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.
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Pros
Pro Ports on the keyboard
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.
Pro DIY
You can really make this board your own. The seperated space bar makes it even more fun than the regular Planck because you can program both space bars differently. You can also get the keys much more easily because you just need a pair of single key width keys.
Pro Split layout
You can set this board up in a very ergonomic manner
Cons
Con Razer switches
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.
Con DIY
Most people just want to buy a keyboard so that they can have it and type on it. But if you're ordering an ortholinear 40% split keyboard, you've probably already got strong enough opinions on switches, key layouts, and keycaps, that you're not going to be very satisfied with a mass market keyboard anyway.
Con Somehow cheaper to spec out than a Planck
This keyboard is based on the Planck. You would think that the Planck, what with its popularity, would cost more. Somehow, it's actually cheaper. This actually has to do with the case/frame. Instead of ordering a really nice prefabricated case, you end up ordering laser cut panels and spacers to create a frame to hold the whole thing high enough off your desk to type comfortably.