I'm a huge fan - why don't more software tools have something like this? I find that it's helpful not to have to learn every shortcut and to be able to access features without multiple unnecessary menus/buttons that clutter up the interface. I also think that it really encourages you to get comfortable using your keyboard exclusively (vs. your mouse.)

The only downside I see to the command center approach vs. a more traditional interface is that once you get used to your most common keyboard shortcuts and stop using command K as frequently, some of the more obscure features are easy to forget about since they're hidden from view.

It’s worked quite well for me. Hitting command + K and typing roughly what action I want to perform has a hit rate of over 50%. Quite impressed by the speed and accuracy of the search powering command center. Makes for a smooth experience.

It seems fairly effective to me, and vitiates the need to memorize umpteen random shortcuts.

I have used it before I quit because Gmail has almost the same shortcut.

The command palette in Superhuman may be one of its best features—something I've loved in Sublime Text for years and am excited to see starting to come to other software as the command palette becomes a new standard UI element. There's even a command palette in Photoshop now, albeit a bit hidden.

One of the best features IMO is that Superhuman's command palette shows the correct keyboard shortcut on the right side of the results. That's such a handy way to discover features via search and learn the keyboard shortcuts over time.

I think this is one of the best product features they launched with, especially with the nested navigation inside of it. Combined with the smart suggestions for keyboard shortcuts, it subtly converts you into a power user.