A total of 3 reviews of this product on Reddit.
You can find the FreestylePro a little cheaper on Amazon, and there is also the FreestyleEdge, which is just a pro with backlighting.
Split Ergo keyboards are not cheap. You could build a Quefrequency. If you decide to build your own, I suggest upgrading the Pro Micro that you plug into to a Proton or Elite C controller.
Kooletron has some on Amazon-https://www.amazon.com/Koolertron-Programmable-Mechanical-Keyboard-Ergonomic/dp/B076FQB6Q3/ref=sr_1_1?keywords=B076FQB6Q3&qid=1552241393&s=gateway&sr=8-1
Red or Black switches,not hot swap.
I bought my good friend from college who is also a programmer, and one of the few guys who will call me out on programming stuff as others tend to defer to me which I dislike because I could be wrong yo, one of these: https://mechanicalkeyboards.com/shop/index.php?l=product_detail&p=1916
The regret is that 44 dollars for shipping is via post and not a proper courier. They weren’t clear about it on the site.
I also regret getting this: https://www.amazon.com/gp/product/B076FQB6Q3/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
I already have an Ergodo Ez, this was just so I had something portable, but I kinda think the Mistel will be better as a portable keyboard. I would swap the two but I sent the Mistel to him directly.