When comparing Vortex Core vs Let's Split, the Slant community recommends Let's Split for most people. In the question“What are the best mechanical keyboards?” Let's Split is ranked 23rd while Vortex Core is ranked 27th. The most important reason people chose Let's Split is:
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.
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Pros
Pro Mass market 40% keyboard
unlike most 40% keyboards, you can just buy this one. That's right! You don't need to assemble it! You don't need to solder anything!
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 Mass Market keyboard
Odds are that if you're willing to go through the effort to get used to a 40% keyboard, you're already pretty excited about mechanical keyboards. You might be happier with a DIY solution
Con 40% Keyboard
Most users will probably have trouble starting out with this keyboard. You need to use function keys to access most of the symbols that you're used to being directly available.
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.