> How much does having the sides separate help?
All the difference in the world.I'm currently on my second Matias Ergo Pro [1]. I love the thing, it is one of my favorite tools I've used in any industry. I put it up there with VIM, the hydraulic press, and Snap-On ratchets. I'll be honest, I prefer Cherry keys to these Alps clones, and the build quality is absolutely excellent in some aspects yet atrocious in other aspects. But a split keyboard with actual F* keys (used heavily in Jetbrains IDEs, plus I've got a bunch of KDE features on them) has become a necessary tool for me.
I'm now considering a Raise keyboard, which like the UHK is missing the F* keys. I'm right now prototyping some F* keypads, not unlike an independent numpad, but in truth I doubt that I will approach the level of comfort as the Matias boards.
I'm happy to answer any questions you have about mechanical or split boards. I've had quite a few )).